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MATHEMATICS.

Mr. ROBERT STAWELL BALL's exhibition and description of a Model of a

Conoidal Cubic Surface called the “Cylindroid," which is presented in the

Theory of the Geometrical Freedom of a Rigid Body ..................

Professor CAYLEY on the Number of Covariants of a Binary Quantic ......
Mr. W. K. CLIFFORD on a Canonical Form of Spherical Harmonics ........
Ņr. J. W. L. GLAISHER on certain Definite Integrals ..........

---- on Lambert's Proof of the Irrationality of , and on
the Irrationality of certain other Quantities .......... ..............

Mr. C. W. MERRIFIELD on certain Families of Surfaces ..................

Mr. F. W. NEWMAN on Doubly Diametral Quartan Curves .........

Professor PURSER’s Remarks on Napier's original Method of Logarithms....

Mr. W. H. L. RUSSELL on Linear Differential Equations.........

on MacCullagh's Theorem ..

Mr. J. J. SYLVESTER on the Theory of a Point in Partitions ........

Sir W. THOMSON on the General Canonical Form of a Spherical Harmonic of

the nth Order ii

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carbons .........................................
The ABBÉ Moigxo on the Poste Photographique . ......

Mr. R. SUTTON'S Account of a New Photographic Dry Process........

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Dr. ANDREW8 on the Dichroism of the Vapour of Iodine ......

66

on the Action of Heat on Bromine.........

Professor APJOHN's Remarks .upon the Proximate Analysis of Saccharine

Matters ..............

M. Gustav BISCHOF on the Examination of Water for Sanitary purposes ..
Mr. PHILIP BRAHAM on the Crystallization of Metals by Electricity........
Mr. J. Y. BUCHANAN on the Rate of Action of Caustic Soda on a watery Solu-

tion of Chloracetic Acid at 100° C.
Dr. F. CRACE-CALVERT on the Estimation of Sulphur in Coal and Coke ....
Mr. JOHN DALZELL and Dr. T. E. THORPE on the Existence of Sulphur Di-
chloride .......

...
Mr. HENRY DEACON on Deacon's Chlorine Process as applied to the Manufac-

ture of Bleaching-powder on the larger Scale.........is

Professor DELFFS on Sorbit .....

- on the Detection of Morphine by Iodic Acid ...

Dr. J. H. GLADSTONE and ALFRED TRIBE's Experiments on Chemical Dy-

namics ....

Dr. J. H. GLADSTONE on Crystals of Silver ...........

Dr. JOHN GOODMAN on Fibrin ................... ..............

Mr. WILLIAM HARKNESS'S Preliminary Notice on a New Method of Testing

Samples of Wood-Naphtha ......

The Rev. H. HIGhron on a Method of Preserving Food by Muriatic Acid ..

Dr. J. SINCLAIR HOLDEN on the Aluminous Iron-ores of Co. Antrim

Professor N. STORY MASKELYNE on the Localities of Dioptase ...

on Andrewsite

Dr. T. Morfar on Ozonometry .........
The ABBÉ MOIGNO on the Photographic Post ......
Mr. Pattison Muir on an Aätimony-ore from New Zealand ..............
Dr. T. L. PHIPSON on Regianic Acid .......

..............

Dr. J. EMERSON REYNOLDS on the Action of Aldehyde on the two Primary

Ureas................

-- on the Analysis of a singular Deposit from Well-

water.....

Dr. Otto RICHTER on the Chemical Constitution of Glycolic Alcohol and its

Heterologues, as viewed in the new light of the Typo-nucleus Theory .....

Mr. WILLIAM CHANDLER ROBERTS on the Molecular arrangement of the Alloy

of Silver and Copper employed for the British Silver Coinage. ...........

Mr. E. C. C. STANFORD on the Retention of Organic Nitrogen by Charcoal .. 81

Mr. JOHN SMYTH, Jun., on Improvements in Chlorimetry ................ 81

Dr. T. E. THORPE's Contributions to the History of the Phosphorus Chlorides 81

Mr. C. R. C. TICHBORNE on the Dissociation of Molecules by Heat ........

Mr. C. TOMLINSON on the behaviour of Supersaturated Saline Solutions when

exposed to the open air ...........

Mr. J. A. WANKLYN on the Constitution of Salts ........ ............

Mr. C. GILBERT WHEELER on the Recent Progress in Chemistry in the United

States ....

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Address by ARCHIBALD GEikit, F.R.S., President of the Section ..........

The Rev. J. F. BLAKE on the Yorkshire Lias and the Distribution of its

Ammonites ......................................

.......... ...

Mr. D. J. BROWN on the Silurian Rocks of the Soạth of Scotland ..........

- on the Upper Silurian Rocks of the Pentland Hills and

Lesmahago ........................

Dr. Robert Brown's Geological Notes on the Noursoak Peninsula and Disco

Island in North Greenland. .......

..............

Dr. BRYCE on certain Fossils from the Durine Limestone, N.W. Suther-

land ............................................................

Mr. W. CARRUTHERS on the Vegetable Contents of Masses of Limestone

occurring in Trappean Rocks in Fifeshire, and the conditions under which

they are preserved ......................

.............

Mr. JOHN CURRY on the General Conditions of the Glacial Epoch ; with Sug-

gestions on the formation of Lake-basins........

Mr. R. DAINTREE on the General Geology of Queensland ................

Mr. W. Boyd Dawkins on the Relation of the Quaternary Mammalia to the

Glacial Period ....................................................

Prof. GEikre on the Progress of the Geological Survey in Scotland ........

Mr. D. GRIEVE on the Fossiliferous Strata at Lochend near Edinburgh ....

Mr. G. J. GRIEVE on the position of Organic Remains near Burntisland ....

Sir RICHARD GRIFFITH, Bart., on “The Boulder Drift and Esker IIills of

Ireland,” and “On the position of Erratic Blocks in the Country”........ 98

The Rev. J. Gunn on the Agency of the Alternate Elevation and Subsidence

of the Land in the formation of Boulder-clays and Glaciers, and the Exca-

vation of Valleys and Bays ....

.................. 100

Mr. John HENDERSON on the Age of the Felstones and Conglomerates of the

Pentland Hills.........

Professor EDWARD HULL and Mr. WILLIAM A. TRAILL on the relative ages

of the Granitic, Plutonic, and Volcanic Rocks of the Mourne Mountains and

Slieve Croob, Co. Down, Ireland .......

................ 101

The Rev. Dr. Hume on the Coal-beds of Panama, in reference mainly to their

Economic Importance.....................

........ 103

Mr. CHARLES LAPWORTI and JAMES WILSON on the Silurian Rocks of the

Counties of Roxburgh and Selkirk .......

Mr. CHARLES LAPWORTH on the Graptolites of the Gala Group .......... 104

Mr. P. W. STUART MENTEATH on the Origin of Volcanoes................ 104

Mr. L. C. MIALL's further Experiments and Remarks on Contortion of Rocks 106

Mr. John MILLER on the so-called Hyoid plate of the Asterolepis of the Old

Red Sandstone................. ................................ 100

Mr. D. MILNE-HOME on the Conservation of Boulders ... .......... 107

Mr. W. S. MITCHELL's further Remarks on the Denudation of the Bath

Oolite :::::::::::::::::

....... 107

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