Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 sider |
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Side 5
... powder , and heating them in a retort over a lamp . The gas which comes off is collected over water , as shown above ( fig . 5 ) . Q. Do all vegetable substances contain these four elements ? A. No , the greater number contain only ...
... powder , and heating them in a retort over a lamp . The gas which comes off is collected over water , as shown above ( fig . 5 ) . Q. Do all vegetable substances contain these four elements ? A. No , the greater number contain only ...
Side 6
... powder , which has a peculiar taste called an alkaline taste , and which becomes moist , and at last runs to a liquid when exposed for a length of time to the air . It is obtained by washing wood ashes ( the ashes left by wood when it ...
... powder , which has a peculiar taste called an alkaline taste , and which becomes moist , and at last runs to a liquid when exposed for a length of time to the air . It is obtained by washing wood ashes ( the ashes left by wood when it ...
Side 7
... powder . They will thus become fami- liar with the word slake . Q. What is magnesia ? A. Magnesia is the white powder sold in the shops under the name of calcined magnesia . It has scarcely any taste , and is extracted from sea water ...
... powder . They will thus become fami- liar with the word slake . Q. What is magnesia ? A. Magnesia is the white powder sold in the shops under the name of calcined magnesia . It has scarcely any taste , and is extracted from sea water ...
Side 13
... powder , which forms nearly the whole substance of the potatoe , and exists in large proportion in oat - meal , in wheaten flour , and in the flour of other kinds of grain cultivated for food . Q. What is gluten ? A. Gluten is a ...
... powder , which forms nearly the whole substance of the potatoe , and exists in large proportion in oat - meal , in wheaten flour , and in the flour of other kinds of grain cultivated for food . Q. What is gluten ? A. Gluten is a ...
Side 14
... powder . Q. Which of these three substances is usually most A. The woody fibre is the most abundant in nearly all plants . Q. In what part of the plant is the starch found most plentifully ? A. The starch is found most abundantly in the ...
... powder . Q. Which of these three substances is usually most A. The woody fibre is the most abundant in nearly all plants . Q. In what part of the plant is the starch found most plentifully ? A. The starch is found most abundantly in the ...
Vanlige uttrykk og setninger
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
Populære avsnitt
Side 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...