Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 5
... thing . A pound of the red oxide costs 6s . 8d . , and gives 14 oz . of metallic mercury , worth 4s . 8d . Q. What is nitrogen ? A. Nitrogen is also a kind of air differing from both of the other two . Like hydrogen , a taper will not ...
... thing . A pound of the red oxide costs 6s . 8d . , and gives 14 oz . of metallic mercury , worth 4s . 8d . Q. What is nitrogen ? A. Nitrogen is also a kind of air differing from both of the other two . Like hydrogen , a taper will not ...
Página 15
... hydrogen . Q. How much of each of these elements is con- tained in water ? A. Every 9 lbs . of water contain about 8 lbs . of oxygen , and 1 lb. of hydrogen . Q. Is it not a very extraordinary thing that liquid CHEMISTRY AND GEOLOGY . 15.
... hydrogen . Q. How much of each of these elements is con- tained in water ? A. Every 9 lbs . of water contain about 8 lbs . of oxygen , and 1 lb. of hydrogen . Q. Is it not a very extraordinary thing that liquid CHEMISTRY AND GEOLOGY . 15.
Página 16
James Finlay Weir Johnston. Q. Is it not a very extraordinary thing that liquid water , which puts out all fire , should consist of two gases , one of which ( hydrogen ) burns readily , while in the other ( oxygen ) bodies burn with ...
James Finlay Weir Johnston. Q. Is it not a very extraordinary thing that liquid water , which puts out all fire , should consist of two gases , one of which ( hydrogen ) burns readily , while in the other ( oxygen ) bodies burn with ...
Página 21
... thing which may be hurtful to the roots of plants . Q. Do such hurtful substances often 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 ...
... thing which may be hurtful to the roots of plants . Q. Do such hurtful substances often 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 ...
Página 27
... A. Yes , the farmer takes his money out of the land , and if he is always taking out and putting no- thing in , it must at last become empty or exhausted . Q. But if he puts something into the soil now CHEMISTRY AND GEOLOGY . 27.
... A. Yes , the farmer takes his money out of the land , and if he is always taking out and putting no- thing in , it must at last become empty or exhausted . Q. But if he puts something into the soil now CHEMISTRY AND GEOLOGY . 27.
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...