Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 4
... collect the metallic mercury as it distils over and trickles down the beak of the retort ( fig . 6 ) . This is not so very costly a process as it ( Fig . 6. ) appears to be , since there is no loss of 4 CATECHISM OF AGRICULTURAL.
... collect the metallic mercury as it distils over and trickles down the beak of the retort ( fig . 6 ) . This is not so very costly a process as it ( Fig . 6. ) appears to be , since there is no loss of 4 CATECHISM OF AGRICULTURAL.
Página 5
... collected over water , as shown above ( fig . 5 ) . Q. Do all vegetable substances contain these four elements ? A. No , the greater number contain only three , viz . carbon , hydrogen , and oxygen . Q. Name some of the more common ...
... collected over water , as shown above ( fig . 5 ) . Q. Do all vegetable substances contain these four elements ? A. No , the greater number contain only three , viz . carbon , hydrogen , and oxygen . Q. Name some of the more common ...
Página 9
... collect these white fumes which are phosphoric acid- by holding over them a cold glass or metal plate , or he may simply burn the phosphorus in a little cup under a tumbler ( fig . 7 ) . Q. Are all these substances to be found in the ...
... collect these white fumes which are phosphoric acid- by holding over them a cold glass or metal plate , or he may simply burn the phosphorus in a little cup under a tumbler ( fig . 7 ) . Q. Are all these substances to be found in the ...
Página 13
... collect in the upper part of the tum- bler ( fig . 10 ) . Q. Do the leaves of plants drink in anything else from the atmosphere ? A. Yes , they drink in watery vapour . Q. What purpose does this vapour serve ? Fig . 10 . A. It serves in ...
... collect in the upper part of the tum- bler ( fig . 10 ) . Q. Do the leaves of plants drink in anything else from the atmosphere ? A. Yes , they drink in watery vapour . Q. What purpose does this vapour serve ? Fig . 10 . A. It serves in ...
Página 21
... collect in the subsoil ? A. Yes , very often , and crops which look well at first , often droop or fail altogether when their roots get down to the hurtful matter . The teacher may illustrate this answer by referring to the layers of ...
... collect in the subsoil ? A. Yes , very often , and crops which look well at first , often droop or fail altogether when their roots get down to the hurtful matter . The teacher may illustrate this answer by referring to the layers of ...
Palavras e frases frequentes
AGRICULTURAL CHEMISTRY ammonia animal require applied bone-earth bones burns called carbon and water carbonic acid gas CHEMISTRY AND GEOLOGY Chlorine clover common salt compost consist of carbon contain cow-dung crops cwts draining dung earth EDINBURGH employed fall to powder farm-yard manure farmer fattening fermentation fertile give gluten grass lands grow guano gypsum hydrogen inorganic kind of air large quantity leaves LECTURES ON AGRICULTURAL light lands lighted taper limestone liquid magnesia marl mixed nitrogen oats obtain oil of vitriol organic food organic matter oxide of iron oxygen gas phosphate of lime phosphoric acid plants require potash potatoes produced profit proportion pupils quicklime roots sea-weed shell sand Silica slaked smell soda soil consists sour starch straw subsoil substances sulphuric acid supply taste teacher may exhibit teacher may illustrate teacher will show turnip usually vegetable waste wheat white fumes wood woody fibre
Passagens conhecidas
Página 17 - Q. Whence is the organic part of the soil derived? A. It is derived from the roots and stems of decayed plants, and from the dung and remains of animals and insects of various kinds. Q. Does this organic part form a large proportion of the soil ? A. Of peaty soils it forms sometimes three-fourths of the whole weight; but of rich and fertile soils it does not usually form more than from a twentieth to a tenth of the whole weight. Q. Can a soil bear good crops which does not contain a considerable...