CALCULATION OF AMMONIA KEQUIKED FOR SAXONY. 305 



further suppose that all soils are inexhaustible in phos- 

 phoric acid, potash, lime, &c. ; and consequently, that 

 the continuous application of salts of ammonia would 

 involve no exhaustion of the soil. If we now reckon 

 how much salts of ammonia, by weight, would be 

 necessary for the kingdom of Saxony, in order to obtain 

 half as much corn again as the unmanured land pro- 

 duces, the result is the following : The kingdom of 

 Saxony comprised, in the year 1843, 1,344,474: acres 

 (1 acre = 1'368 Eng. acre) of arable land, exclusive of 

 vineyards, gardens, and meadows. If we suppose that 

 each acre yields one corn-crop in two years, and that 4 

 cwt. salts of ammonia had to be applied in the way of 

 manure, the kingdom of Saxony would require annually 

 2,688,958 cwt. 134,447 tons of salts of ammonia. 



Those who possess even a slender acquaintance with 

 chemical manufacture, and know from what raw ma- 

 terials (animal refuse and gas water) salts of ammonia 

 are procured, must easily see that all the manufactories 

 in England, France, and Germany put together, could 

 not produce so much as the fourth part of the salts of 

 ammonia required by comparatively a very small coun- 

 try, in order to increase its products in the manner pro- 

 posed. 



With a similar distribution we can easily calculate 

 how much salts of ammonia would be required for the 

 German provinces of Austria with 11 million jochen 

 (1 joch = 1-422 Eng. acre) of arable land ; for Prussia, 

 with 33 million morgen (1 morgen 0'631 Eng. acre) ; 

 for Bavaria, with 9 million tagwerk (1 tagwerk = 0*842 

 Eng. acre) ; and even if it were possible to quadruple 

 the manufacture of salts of ammonia, this would have 

 no material influence upon the crops. 



The cheapest ammonia is conveyed to Europe in 

 Peruvian guano, which, taking a high average, contains 

 16 per cent. 



Peruvian guano is principally used in the cultivated 

 lands of Europe, as in England, France, the Scandina- 

 vian countries, Belgium, the Netherlands, Prussia, and 

 the German States, comprising, exclusive of Austria, 



