Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 4
... heavy bodies up with it through the air . Q. What is oxygen ? A. Oxygen is also a kind of air , in which a candle burns with great brilliancy , in which animals also can live , and which is heavier than hydrogen or com- mon air . It ...
... heavy bodies up with it through the air . Q. What is oxygen ? A. Oxygen is also a kind of air , in which a candle burns with great brilliancy , in which animals also can live , and which is heavier than hydrogen or com- mon air . It ...
Página 10
... it does not , like hydrogen , take fire itself ; that it is so heavy , that it may be poured from one glass to another ( fig . 8 ) ; and that , 3 when poured from a large tumbler , a common candle 10 CATECHISM OF AGRICULTURAL.
... it does not , like hydrogen , take fire itself ; that it is so heavy , that it may be poured from one glass to another ( fig . 8 ) ; and that , 3 when poured from a large tumbler , a common candle 10 CATECHISM OF AGRICULTURAL.
Página 19
... a loam ; if much lime was present , I would call it a calcareous loam ; and if it were a clay with much lime , I would call it a calcareous clay . Q. What do you understand by light and heavy lands CHEMISTRY AND GEOLOGY . 19.
... a loam ; if much lime was present , I would call it a calcareous loam ; and if it were a clay with much lime , I would call it a calcareous clay . Q. What do you understand by light and heavy lands CHEMISTRY AND GEOLOGY . 19.
Página 20
... heavy lands , such as con- tain much clay . The teacher may illustrate this , by referring to the different kinds of ... heavy or light lands usually stand most in need of draining ? A. The heavy clay lands retain water most , and should ...
... heavy lands , such as con- tain much clay . The teacher may illustrate this , by referring to the different kinds of ... heavy or light lands usually stand most in need of draining ? A. The heavy clay lands retain water most , and should ...
Página 21
... corn reaped from them is not sufficient to pay the farmer for his trouble . Q. How could these heavy clay lands be rendered lighter and more cheap to work ? A. By draining , subsoil ploughing , and by the CHEMISTRY AND GEOLOGY . 21.
... corn reaped from them is not sufficient to pay the farmer for his trouble . Q. How could these heavy clay lands be rendered lighter and more cheap to work ? A. By draining , subsoil ploughing , and by the CHEMISTRY AND GEOLOGY . 21.
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...