Rural chemistry: an elementary introduction to the study of the science in its relation to agriculture / [Edward Solly].

  • Solly, Edward, 1819-1886
Date:
1846
Catalogue details

Licence: Public Domain Mark

Credit: Rural chemistry: an elementary introduction to the study of the science in its relation to agriculture / [Edward Solly]. Source: Wellcome Collection.

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    the addition of earth or brickdust. The presence of these substances may be roughly ascertained in guano by burning a portion. The ashes left by pure guano are white, or nearly so ; while, if soil or .brickdust has been added, the oxide of iron, which they always contain, will give the ashes more or less a red-brown colour. 689. The composition of wood ashes varies very considerably, according to the wood from which it is obtained. The composition of three kinds of wood-ash, as given by Sprengel, is :— OAK. BEECH. SCOTCH Potash . 162 221 22 Soda • • • • . 67 33 22 Lime . 174 250 232 Magnesia . 14 50 50 Alumina . • ) 23 t Oxide of iron . 81 38 | 170 Oxide of manganese , .) 38 ) Silica .... . 269 55 66 Chlorine . . 24 19 23 Sulphuric acid . 34 77 22 Phosphoric acid . . 19 56 28 Carbonic acid . 155 140 365 1000 1000 1000 690. In the process for making potash or pearlash(157), the greater part of the soluble salts contained in the wood-ashes is washed out; the remainder is a valuable manure, and often contains a considerable quantity of phosphoric acid. The refuse ash from soap factories consists of the same matters. The following table exhibits the composition of three kinds of “ lixiviated ashes,” according to Berthier :—