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por ano CITY MICROSCOP

MICROSCOPIC PREPARATIONS.

ERNEST HINTON,
12, VORLEY ROAD, UPPER HOLLOWAY, LONDON, N.

(TWENTY YEARS WITH E. WHEELER.) E. H. begs to inform his friends and the Scientific World that he has commenced business at the above address, and from his long experience with Mr. WHEELER, he will be enabled to submit to their notice a choice selection of newly-mounted Objects in all branches of Nature at the lowest prices.

LORD S. G. OSBORNE'S DIATOMESCOPE, Post-free, 12s.

See “ English Mechanic,August 22nd, page 561.
CITY MICROSCOPICAL STUDIO AND GEOLOGICAL MUSEUM
· For the sale of Microscopic Objects, Minerals, Fossils, Rock Specimens, Shells,
Crustacea, Echinoderms, Corals, Flint Implements, Cabinets,

Geologists' Hammers, &c.
THOMAS D. RUSSELL, 78, NEWGATE STREET, E.C.,

CLOSE TO THE NEW GÉNERAL POST OFFICE.

MICROSCOPICAL SPECIALITIES, ILLUSTRATING THE GROWTH, REPRODUCTION, AND STRUCTURE OF PLANTS. Diatoms mounted in monobromide of Naphthaline .... 1/- and 1/6 each. | Vaucheria in fruit, Batrachospermum and 1/- per slide. Pollen grain of Enothera emitting tube ................ 1/1 each.

Pediastrum .... V.S. of Fertilized Ovule of Mallow ......

Spirogyra in conjugation, stained and mounted T.S. of Stem and Leaf of Nepenthes, double-stained .... 1/3

without contraction .....

on ..................... 1/6 Specially prepared illustrations of Sachs' and Thome's Textbooks of Botany, being copies of Figures in those works. All Post-free.)

CHAS. V. SMITH, CARMARTHEN. [Lists on Application. SECOND-HAND MICROSCOPES AND OBJECTIVES. A large assortment by ROSS. BECK, COLLINS, SWIFT, and other first-class Makers, on Sale, very cheap.

MICROSCOPIO OBJECTS in great variety. Spécialité Physiological and Pathological Tissues. 500 SECOND-HAND PHOTOGRAPHIC LENSES AND CAMERAS By ROSS, DALLMEYER, TENCH, VOIGTLÄNDER, and all other esteemed Makers. The Cheapest and Best Stock in Londor.'

New Catalogues gratis on application. Purchases and Exchanges made. Instruments Repaired and Relacquered. SANDS & HUNTER, 20, CRANBOURNE STREET, LONDON.

.........

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NEW PREPARATIONS

OF INSECTS.

This Insect is without doubt

TETANOCERA ARATORIN

one of the most beautiful THE MARSH FLY.

when examined under polarA Magnificent preparation for

ised light. Every muscle can the Polariscope or ParaboWITHOUT PRESSURE.

be distinctly seen in the head, loid.

tongue, thorax, abdomen and 35. Post-free. FRED. ENOCK, legs, besides showing the

Striated muscular fibres. WOKING. HOW AND CO,'S NEW "POCKET MICROSCOPE LAMP. Very convenient and portable, gives ample Illumination, has all necessary adjustments, is provided with a Cylindrical Case, and can be conveniently carried in the breast coat pocket; when charged

with sufficient Oil to burn for above 3 hours, weighs under 12 oz. Price 8s. 6d. Microscopists who are in the habit of exhibiting at the Meetings of their respective Societies and elsewhere,

should provide themselves with this little Lamp.
MICRO-PETROLOGY, TYPICAL ROCK SECTIONS, 1/6 AND 2/- EACH.
JAMES HOW & Co., 73, FARRINGDON STREET, LONDON.
Sole Maker of the Registered

MAGIC LANTERN & SLIDES
BRIDGEMAN TRIPLE LANTERN ;

MAGIC

FOR PRESENTS, the Portable LUKE BI-UNIAL ;

and

From 7s. Bd.

Dissolving View Mr. MALDON'S TRIPLE LANTERN, LANTERNS. used by him nightly with great

NEW APPARATUS.

NEW SLIDES. success.

NOVEL EFFECTS.

New Illustrated SPECIAL SHOW ROOM,

Catalogue Gratis, 406, STRAND.

post-free to all Five Hundred Slides, illuminated

parts. by gas, for Selection.

[graphic]

ALSO,

J. H. STEWARD, 406 & 66 STRAND, 456 WEST STRAND, 54 CORNHILL, LONDON.

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WATKINS AND DONCASTER, Naturalists and Manufacturers of Entomological Apparatus and Cabinets. N.B.- For Excellence and Superiority of Cabinets and Apparatus, references are permitted to

distinguished Patrons and Colleges, &C. Plain Ring Nets, Wire or Cane, including stick, a/.

Breeding Cage, 2/6, 5/-, and 10/6. Folding Nets, 4/6 and 5/6.

Ditto, New Style for keeping the plant food fresh for a longer Umbrella Nets, 5/6 and 8/- (self-acting).

period, 4- and 7/6. . Pocket Boxes, -76; corked both sides, -79, 1/-, and 1/6.

Coleopterist's Collecting Bottle, with tube, 1/6. Zinc Relaxing Boxes, 1/6, 2/-, and 3/-.

Ditto, Tin Boxes, 2/6. Ditto, large size, with strap, 6/6.

Ditto, Japanned Pocket Case, fitted with 26 tubes, 5/.. Nested Chip Boxes, 4 dozen, -19.

(black). Botanical Cases, japanned, double tin, 1/6, 47, 57,614,9/-. Entomological Pins, assorted or mixed, 1/- per oz. (white or Botanical Paper, 1/1, 1/4, 1/9, and a/2 per quire. (Too heavy Glass Killing Bottles or Tubes ready for use, ils, 1/6.

for post.) Pocket Lanterns, 2/6 to 7/6.

Insect Cases, imitation mahogany, 3/6 to 11/-. Sugaring Tin, with brush, 2/6.

[box. Cement for replacing Antennæ, -76 per bottle. Mite Destroyer (not inflammable nor dangerous to use), -/- per Forceps for removing Insects, 2/6 per pair. (Supplied to Store Boxes, 2/6, 4., 5., and 6/-.

Collectors all over the world.) Ditto, Book Pattern, 8/6, 9/6, and 10/6..

Cabinet Cork, 7 X 34, best quality, 1/4 per dozen sheets. Setting Boards, flat or oval, z-in., -/6; it-in.-/8; it-in., -/9 Pupa Diggers, al. Insect Lens, 1/6 to 7/6.

-in., -/10; at-in. 1/-; z-in., 1/2; 3t-in., 1/4; 4-in., 1/6 ; Glass Top Boxes, per dozen, 1/8, 2/2, 2/6.

4t-in., 1/8; 5-in., 1/10. Complete set of 14 boards, 10/6. Egg Drills, -/3. Setting Houses, 9/6 and 11/6; corked back, 14/6.

Metal Blow-pipes, -/8. Zinc Larva Boxes, 1/5, 1/6, and 2/-, flat or oval.

Setting Needles, 6d. per box. All Articles enumerated are kept in stock, and can be sent immediately on receipt of order. For Sale, a large Assortment of Ova and Pupæ of both British and Foreign Butterflies and Moths.

CABINETS.-Special Show Room.
The following are the prices of a few of smallor sizes; lor moasurements and larger sizes 800 Cataloguo (48 pp.)

Minerals and Dried
Insect.
89.

Egys. Minerals and Dried
Plants, Fossils, &c.

Insect.
Insect.

£885. Plants, Fossils, &c. 4 Drawers .... 14/.. .. 12/6 .... 10/6

8 Drawers .... 32/- .... 30/- .... 23/6 „ .. .. 18/• .. .. 16/6 .. .. 15/

10 „ ... 48/- .. .42/- .. .. 40/A LARGE STOCK OF INSECTS AND BIRDS' EGGS.

Birds, Mammals, &C., Preserved and Mounted by First-class workmen.

36, STRAND, W.C. (FIVE DOORS FROM CHARING CROSS). MAGIC LANTERN AND DISSOLVING VIEWS. The Cheapest and Best House in London for Phantasmagoria, Lanterns,

and Dissolving Views, &c.
C. BAKER, 243, 243}, & 244, HIGH HOLBORN.

Phantasmagoria Lantern, with 31-inch Condenser, will show a disc 10 feet in

diameter, with Fountain Solar Argand Lamp, suitable for Schools or Lecturers,

£2 17s. 6d. Pair of Ditto, arranged for Dissolving Views, in Case, complete, £7. A New Portable Lantern, Burning Paraffine Oil, with Patent Double Wick Lamp and 3t-in. Condenser, £3 3s. Od., or with Triple Wick, £3 8s. Od.

PHOTOGRAPHED SLIDES FOR THE ABOVE.
Popular Tales, English or Foreign Scenery, &c. Plain, Is, 3d.; Coloured, from 2s. 6d, each,
An improved Lantern with Petroleum Lamp and Forty-eight Views, including a

Moving Slide and Chromotrope, from 15s. to 4os.
A COLLECTION OF LANTERNS AND VIEWS SPECIALLY KEPT FOR HIRE.

CATALOGUES FREE BY POST.

AL

MICRO-SLIDES FOR SCIENCE CLASSES.

Mr. PIFFARD'S PATENT COUNTER-SUNK SLIPS are now on Sale.

Two sizes are ready, 3-16 and 5-8, at 6s, per dozen. They are thus described in the Journal of the Royal Microscopical

Society, August, 1884:

“PIFFARD'S SLIDES.-Mr. B. Piffard has patented a slide, which is made by forming with a diamond a round recess in an ordinary slide. In this the object is placed, and covered with thin glass. The upper surface of the slide is thus perfectly smooth, the cover-glass being even with the slide. There is no danger of the cover-glass and object being knocked offand the recess causes a very beautiful diffusion of light."

REMITTANCE WITH ORDER. ENLARGED CATALOGUE READY, POST FREE. B. PIFFARD, Hill House, Hemel Hempstead, Herts.

Possessing all the Properties of the finest Arrowroot,

BROWN AND POLSON'S CORN FLOUR

Is a Household Requisite of Constant Utility FOR THE NURSERY, THE FAMILY TABLE, AND THE SICK ROOM. NOTE.-Unlike many others, this Corn Flour bears the Name of its Manufacturers, who offer the

guarantee of their long-established reputation for its uniformly Superior Quality.

THE GRESHAM
LIFE ASSURANCE SOCIETY.

ESTABLISHED 1848.
Head Office-ST. MILDRED'S HOUSE, POULTRY, LONDON, E.C.

FUNDS, 1884.

Realised Assets ...

• " ... ... £3,491,376 Life Assurance and Annuity Funds ... ... ... ... ... £3,391,789 Annual Income ... ... ... ... ... ... ..

... £685,369 Moderate Rates of Premium, Liberal Scale of Annuities. Loans granted upon Security of Freehold, Copyhold, and Leasehold Property, Life Interests, and Reversions; also to Corporate and other Public Bodies, upon Security of Rates, &c.

BONUS YEAR, 1885. POLICIES effected before the ist July 1885 on the profit tables, with annua! premiumis, will participate in the Bonus to be declared next year, in the manner prescribed by the regulations of the Society.

JOSEPH ALLEN, Secretary. Prospectus, Reports, and Proposal Forms can be obtained on application to the Society's Agents and Branch Offices, or to

JOSEPH ALLEN, Secretary.

NORTH BRITISH AND MERCANTILE INSURANCE COMPANY

INCORPORATED BY ROYAL CHARTER AND SPECIAL ACTS OF PARLIAMENT. Authorised Capital, £3,000,000. Subscribed Capital, £2,500,000. Paid-up Capital, £625,000. Chairman-John White Cater, Esq.

Deputy-Chairman-CHARLES Morrison, Esq. Manager of Fire Department-G. H. BURNETT.

Manager of Life Department and Actuary-HENRY COCKBURN, Foreign Sub-Manager PHILIP WINSOR.

Secretary-F. W. LANCE.

• FIRE DEPARTMENT. The Net FIRE FUNDS, irrespective of the Paid-up Capital, now amount to £1,592,235 5s. 2d.

LIFE DEPARTMENT. The LIFE FUND now amounts to £3,340,918 118. 2d. The ANNUITY FUND now amounts to £500,275 178. 11d. THE PRINCIPLES on which this Company is conducted combine the system of Mutual Assurance with the safety

of a large Protecting Capital and Accumulated Funds, and thus afford all the facilities and advantages which can prudently be offered by any Life Assurance Office.

NINETY PER CENT. of the WHOLE PROFITS is divided among the Assurers on the Participating Scale. The PROFITS are divided every Five Years. POLICIES are INDISPUTABLE after Five Years. ANNUITIES of all kinds are granted.

Prospectuses and every Information can be obtained at the Chief OfficesLONDON : 61, THREADNEEDLE ST., E.C. WEST END OFFICE, 8, WATERLOO PLACE, S.W. EDINBURGH, 64, PRINCES ST. BRITISH EMPIRE MUTUAL

LIFE ASSURANCE COMPANY
NEW BRIDGE STREET, LONDON, E.C.
Incorporated under Act 7 & 8 Vict. cap. 110, and further empowered by Special Act, 15 Vict, cap. 53.

DIRECTORS.
Joun Runtz, Esq., Chairman.

J. H. TROUNCER, M.D., Lond., Deputy-Chairman.
H. M. BOMPAs, Esq., Q.C.
William G'ROSER, Esq.

GEORGE Paillips, Esq. Hugu CAMPBELL, M.D.

PEARSON Hill, Esq.

GEORGE ROOKE, Esq.
ROBERT FREEMAN, Esq.
DONALD MUNRO, Esq.

John E. TRESIDDER, Esq.
WILLIAM HENRY Wills, Esq., M.P.
Accumulated Fund, 1883, nearly £1,000,000 | Profits already Divided . .. £847,000
Annual Income, 1883 ... ... ... €184.101 | Claims Paid to 31st Dec, 1883 £1,166,027
Policies in force ... ... ... £4,434,661.

EDWIN BOWLEY, F.I.A., F.S.S., Secretary.

PREPARATIONS for the MICROSCOPE. NEW SLIDES WORTHY SPECIAL ATTENTION.

Type Slide Diatomaceæ. 100 different kinds, all named · 21s.
Type Slide Foramenifera. 19 different kinds, all named . 12s.
Most beautiful and elaborate arranged Slides of Diatoms,

Anchors and Plates of Synapta. Wheels of Chirodota,
&c. For dark ground illumination these are unequalled,

each . . . . . . . . 7s. 6d., 10s., 16s., 21s. Diseased Lung from Coal Miner, Chimney Sweep, Saw

Grinder, Gin Drinker, Effects of London Smoke,

each . . . . . . . . . . . . . . ls. 9d. Jaw of Mole, Horizontal Section. Through all the tecth

in situ . . . . . . . . . . . . . . Human Scalp. Double Stained Vertical or Horizontal

Sections, each . . . . . . . . . . . . ls. 9d. Any of the above forwarded on recript of remittance, and

exchanged if not approved.

W. WATSON & SONS having purchased the Business of Mr. E. WHEELER, Late of Tollington, Road, Holloway, including between 40,000 and 50,000 choice specimens, are enabled to offer an unequalled. selection of objects of interest.

FUST PUBLISITED,
(to include Mr. WHEELER's Stock)
New Classified List of Objects for the

Microscope.
Illustrated Catalogue of Microscopes and

Apparatus.
Either of the above forwarded post-free to any part of
the world on application.

W. WATSON & SONS, 313, HIGH HOLBORN, LONDON.

OPTICIANS TO HER MAJESTY'S GOVERNMENT.

ESTABLISHED 1837.

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N reference to the se- | general appearance, a British fresh-water spider-mite,

ries of twelve Plates of the Order Acarina, and Family Hydrachnea, of
published during which there are six Genera; four, Arrenurus, Atax,
the past year, the Eylaïs, Hydrachna, the most attractive in beauty ;
writer is desirous Diplodontus and Limnochares, parasitic and some-
of thanking nu what obscure.
merous correspon-

The specimen figured is an elegant and lively dents for valuable individual of a form commonly met with : Eylaïs, so information. designated from collation with published description ; chiefly relating to the writer, however, was fortunate in the proof of the minute details of plate having been seen by Mr. C. F. George of structure, and Kirton in Lindsey, whose articles in this journal, on nomenclature; these particular organisms, commencing Sept., 1882, and to reply to continued at intervals until August 1883, and illussuggestions, trated with woodcuts "of scientific importance and worthy of consid accuracy, establish a basis of valuable authority on eration, which, if the subject; the number of the eyes in these minute accepted (in some creatures appears to be a matter of important obserinstances), would vation, and, as Mr. George remarks, their singular advance the selec peculiarity and arrangement cannot be overlooked.

tion of subjects In the drawing, their position is only indicated; beyond the scope of “popularity” into the detail would have demanded an amplification so region of biological research. With low powers, expansive as to have taken the subject beyond the and special illumination seeking picturesque effects, scope of a general view of the entire creature ; under many deep and important peculiarities, possibly deeper examination, four eyes are discovered in pairs, bearing upon classification, necessarily cannot be upon the dorsal surface of the cephalothorax, apdetailed or even exhibited ; and to enter into intri proximating so closely that each pair is seemingly cacies of structure, with higher objectives (as has combined in one; even in such minute Acarina these been proposed), would far outstrip the motive of organs possess an ocular power superior to those of the work; it may therefore be desirable to repeat that insects, and often the appearance of a solitary eye the raison d'être of “ Graphic Microscopy” is to en under closer examination is found to be what has courage the observations of our younger subscribers, been happily termed “helved,” the eye projecting on in presenting them with an attractive and accurate two rounded semi-circles, reniform, a fusion of two picture of a distinct subject : simple, popular, easily stemmata ; a divided eye ball. Such a minute condiprocurable, and susceptible of artistic treatment. tion could not have been shown in a field involving

The present example, drawn from life, under the general aspect of the upper and under sides of the moderate amplification, necessarily screening specific same individual, but it is a peculiarity of significant character (the same individual furnishing the dorsal | importance in the decision of species, and upon this and ventral aspect), fairly represents in form and point (apart from the portraiture of the specimen), Mr.

No. 241.- JANUARY 1885.

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