201 



Phosphoric Acid, 0.03 0.40 



Carbonic Acid, 4.00 



Moisture, 2.00 0.00 



100.00 



MANURES SUITED FOR WHEAT. 



The mild left by the overflowing of the Nile, serves as the principal 

 manure of the Egyptians; by it they are enabled to raise excellent 

 crops of wheat Its composition has been determined by Laissaigne, a 

 French chemist; it is as follows: 



Silica, 42.50 



Alumina, _. 24.25 



Peroxide of Iron, ._ 1 3.05 



Carbonate of Lime, _. 3.85 



Carbonate of Magnesia, 1.20 



Magnesia, 1.05 



Ulmic Acid, ._ 2.80 



Water, 10.70 



100.00 



Manures which abound in Nitrogen are generally best suited to the 

 growth of wheat. Professor Johnston proved this by experiments, 

 which are recorded in his "Lectures on Agricultural Cbemistry ;'' take 

 for instance a wheat plant, and examine the composition of the flour it 

 contains, as raised by being dressed with diflerent manures. It will bo 

 found that its gluten, which contains a large per centage of nitrogen, is 

 invariably increased by the increased proportion of nitrogen in the 

 manure. 



M. Hermstadt, from equal quantities of the same kind of wheat 

 Bown on the same description of soil, and manured with equal weights 

 of different manures, obtained starch and gluten in the following pra- 

 portions, from 100 parts of each sample of grain: 



gluten, starch. 



Soil simple, 9.02 G6.07 



Potatoe Haulm,... 6.06 05,9 1 



Cowdung 12.00 G2.03 



Pigeons dung, 12.02 63.02 



26 



