Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 2
... less readily in the fire . Wood - charcoal , lampblack , coke , and black - lead , are varieties of carbon . The teacher will here exhibit a piece of charcoal and show how it burns in the fire , or in the flame of a candle . Q. What is ...
... less readily in the fire . Wood - charcoal , lampblack , coke , and black - lead , are varieties of carbon . The teacher will here exhibit a piece of charcoal and show how it burns in the fire , or in the flame of a candle . Q. What is ...
Página 2
... less readily in the fire . Wood - charcoal , lamp- black , coke , and black - lead , are varieties of carbon . The teacher will here exhibit a piece of charcoal and show how it burns in the fire , or in the flame of a can- dle . Q. What ...
... less readily in the fire . Wood - charcoal , lamp- black , coke , and black - lead , are varieties of carbon . The teacher will here exhibit a piece of charcoal and show how it burns in the fire , or in the flame of a can- dle . Q. What ...
Página 9
... less than 2 lbs . of ash . Q. Does the ash of different plants contain all these substances in the same proportion ? A. No. They exist in different proportions in the ash of different plants - the ash of wheat , for exam- ple , contains ...
... less than 2 lbs . of ash . Q. Does the ash of different plants contain all these substances in the same proportion ? A. No. They exist in different proportions in the ash of different plants - the ash of wheat , for exam- ple , contains ...
Página 18
... less productive ? A. It will , if badly managed and constantly cropped . Q Then how can you keep up the supply ? A. By ploughing in green crops , -by growing clo- vers , and other plants which leave long roots in the soil , -by ...
... less productive ? A. It will , if badly managed and constantly cropped . Q Then how can you keep up the supply ? A. By ploughing in green crops , -by growing clo- vers , and other plants which leave long roots in the soil , -by ...
Página 19
... less hardened sand- stones , limestones , and clays . The teacher may exhibit as specimens of Sandstone - red and white , or other freestones ; Limestone - chalk and blue or other limestones ; Clays - roofing slate , and the shale and ...
... less hardened sand- stones , limestones , and clays . The teacher may exhibit as specimens of Sandstone - red and white , or other freestones ; Limestone - chalk and blue or other limestones ; Clays - roofing slate , and the shale and ...
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...