Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 3
... taper intro- duced into it , when the taper will be extinguished , while the gas itself will take fire and burn at the mouth of the bottle . Lastly , if the teacher possesses a small balloon , he may fill it with the gas by attaching it ...
... taper intro- duced into it , when the taper will be extinguished , while the gas itself will take fire and burn at the mouth of the bottle . Lastly , if the teacher possesses a small balloon , he may fill it with the gas by attaching it ...
Página 4
... taper burns when intro- duced into it . The easiest and least trouble- some mode of preparing oxygen gas , is to heat red oxide of mer- cury in a small retort by means of a spirit lamp , and to collect the metallic mercury as it distils ...
... taper burns when intro- duced into it . The easiest and least trouble- some mode of preparing oxygen gas , is to heat red oxide of mer- cury in a small retort by means of a spirit lamp , and to collect the metallic mercury as it distils ...
Página 5
... taper will not burn nor will an animal live in it , but unlike hy- drogen , it will not burn , and it does not take fire when brought near the flame of a candle . It is a little lighter than atmospheric air , of which it forms four ...
... taper will not burn nor will an animal live in it , but unlike hy- drogen , it will not burn , and it does not take fire when brought near the flame of a candle . It is a little lighter than atmospheric air , of which it forms four ...
Página 8
... taper burns in it with a dull smoky flame . It exists in common salt in large quantity . The teacher will exhibit a bottle of this gas , and may advert to the remarkable fact that this very noxious gas should form more than half the ...
... taper burns in it with a dull smoky flame . It exists in common salt in large quantity . The teacher will exhibit a bottle of this gas , and may advert to the remarkable fact that this very noxious gas should form more than half the ...
Página 10
... taper is extinguished by it ; but that 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 ...
... taper is extinguished by it ; but that 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 ...
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...