120 INDIAN CORN. 



not only largely increase the aggregate amount, but 

 will be fully equal in value to the best animal 

 manure. 



2. POUDRETTE, or the various preparations of night- 

 soil. This is a highly concentrated and valuable fer- 

 tilizer. The simplest, and perhaps the best mode of 

 preparing it, is to combine with the night-soil a lib- 

 eral proportion of dry mould, charcoal-powder, or 

 sulphate of lime (gypsum). These may all three be 

 added with excellent effect. Home-made poudrette, 

 when rightly prepared, is much superior to the com- 

 mercial article. 



3. The various GUANOS, of which the Peruvian is 

 by far the best. The powerful nature of this fertilizer 

 requires caution in the use of it. In solution it is 

 found useful for steeping, and is also applied as a 

 liquid manure. 



4r. BONE-DUST. The value of this fertilizer, for im- 

 mediate use, depends in a great measure on its being 

 finely ground. By the usual mode of grinding it, the 

 effect, though more lasting, is comparatively slight the 

 first season. The Flour of Bone is a finer preparation 

 than the other, and though more costly, is far better 

 for immediate effect. 



5. SUPER-PHOSPHATE OF LIME, or vitriolized bones. 

 The immediate value of bone-dust is increased, and 

 the effect rendered much more speedy, by converting 

 it into super-phosphate of lime. This is done by add- 

 ing to the ground bones from one-half to one-third 

 of their weight of sulphuric acid (according to the 

 strength and purity of the acid), with a like quantity 



