FERTILIZERS. 95 



ammonia. As the ammonia in the phosphate was doubt- 

 less from bone, let us get the remainder from sulphate of 

 ammonia, which is a form in which it will act more 

 promptly, and start the crop, while that from bone will 

 feed it later in the season. Now, sulphate of ammonia 

 contains 25 per cent pure ammonia : therefore we get our 

 remainder of ammonia in about || of a hundred pounds, 

 = 140 pounds of sulphate of ammonia. Passing next to 

 the potash needed, viz., 80 pounds, let us get part of it 

 in muriate of potash, and part from wood ashes, where the 

 potash is the carbonate of potash. 80 per cent of muriate 

 of potash contains just above 50 per cent (50.46) of pure 

 potash. Taking a hundred pounds of this, and we have 

 remaining, to be got from unleached ashes, 88 50, = 38 

 pounds. Now, a hundred pounds of unleached wood 

 ashes, containing about 7 per cent of carbonate of potash, 

 would contain about | as much of pure potash, f of 7 = 

 4^ pounds ; 38 -f- 4^ = 9 hundred pounds nearly. As 

 unleached wood ashes weigh about 45 pounds to the 

 bushel, in 9J hundred pounds there would be about 21 

 bushels. Now, using these ashes, we have also brought 

 with them some phosphoric acid, for wood ashes unleached 

 has about two per cent of it ; therefore in our 21 bushels 

 we should have 21 X 2 = 42 pounds. Let us take 

 away sufficient of the bone to allow for the 42 pounds. 

 As the boi/e has 11 per cent, we will drop as many hun- 

 dred pounds as 11 is contained in 42, = 4 nearly. But, in 

 dropping these 450 pounds of bone, we, of course, drop 

 also the ammonia contained in it, which would be 4J X 3J, 

 = 16 pounds nearly. To get this 16 pounds of am- 

 monia, we will take some dried blood, which analyzes 13 

 per cent ammonia. It would require ^| of 100 pounds of 

 this, = 133 pounds nearly. Now, bringing all the sources 

 together, and we have 



