The Farmer's Manual of Agricultural Chemistry: With Instructions Respecting the Diseases of Cereals, and the Destruction of the Insects which are Injurious to Those Plants

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George Knight and Sons, 1853 - 226 páginas
 

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Página 110 - ... matters, the washings of foul linen, the filth and refuse of many hundred manufactories, the offal and decomposing vegetable substances from the markets, the foul and gory liquid from slaughter-houses, and the purulent abominations from hospitals and dissecting-rooms...
Página 40 - The employment of animal manure in the cultivation of grain, and the vegetables which serve for fodder to cattle, is the most convincing proof that the nitrogen of vegetables is derived from ammonia.
Página 209 - ... fields by the Red Tower, did not seem to intend remaining there, but were thrown to the ground by the force of the wind, and there laid their eggs; a vast number of which being turned up, and crushed by the plough, in the beginning of the ensuing spring, yielded A yellowish juice. In the spring of 1748, certain little blackish worms were seen lying in the fields and among the bushes, sticking together, and collected in clusters, not unlike the hillocks of moles or ants. As nobody knew what they...
Página 207 - ... to carry it sometimes over the sea ; and although a single individual can effect but little evil, yet when the entire surface of a country is covered by them, and every one makes bare the spot on which it stands, the mischief produced may be as infinite as their numbers.
Página 40 - Plantes" 26-7, and that of winter wheat 3-33 per cent. Such great differences must be owing to some cause, and this we find in the different methods of cultivation. An increase of animal manure gives rise not only to an increase in the number of seeds, but also to a most remarkable difference in the proportion of the gluten which they contain.
Página 206 - It is armed with two pairs of very strong jaws, the upper terminating in short and the lower in long teeth, by which it can both lacerate and grind its food — its stomach is of extraordinary capacity and powers — its hind legs enable it to leap to a considerable distance, and its ample vans are calculated to catch the wind as sails, and so...
Página 212 - ... one that came on board us a hundred certainly were drowned. We observe in the months of May and June a number of these insects coming from the south, and directing their course to the northern shore; they darken the sky like a thick cloud ; but scarcely have they quitted the shore, when they, who a moment before ravaged and ruined the country, cover the surface of the sea with their dead bodies. By what instinct do these creatures undertake this dangerous flight ? Is it not the wise institution...

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