196 AMERICAN MANURES. 



WATSON & CLARK'S SUPERPHOSPHATE. 



The above fertilizer, from which the samples 

 for analyses were selected, was purchased from 

 the manufacturers at their office in Philadelphia. 

 It is put up in 200 Ib. bags ; the one purchased 

 weighed 201 i Ibs. Its mechanical condition was 

 good; the mineral phosphate from which it 

 was manufactured had been finely ground, and 

 there were no hard lumps to interfere with its. 

 application by drilling. The circular of these 

 manufacturers is a model of its kind. They 

 frankly state the kind of material used, and the 

 source from which it is procured. They give no 

 analyses of their article, which they should do, 

 but say they manufacture a superphosphate of 

 lime 



"Under the supervision of PROF. JAMES C. BOOTH of the 

 U. S. Mint, and every parcel made is analyzed by him or his 

 partner, DR. GARRETT, in order to ascertain if it comes up to 

 the required standard." 



They do not inform us what this standard is, 

 but as they profess to manufacture a super- 

 phosphate, the required standard should be that. 

 The analysis shows by the Insoluble Phosphoric 

 Acid how far they fail. But if we take the 

 price at which it is sold into account, it is one 

 of the cheapest fertilizers in the market; i. e., 

 the farmer gets more of what he needs for his 

 money than in many other fertilizers more 

 strongly recommended. 



