306 BOARD OF AGRICULTURE. 



From 275 tons to 350 tons, at 



350 " 450 " . 



450 " 575 " . 



575 " 700 " . 



700 " 850 " . 



850 " 1,000 " . 



For 1,000 tons, 



The same return will be made to purchasers at the end of the 

 season (that is to say, in June and December) on the quantity pur- 

 chased by each party during the preceding six months, as if the 

 entire amount bought had been taken at one and the same time. 



Trusting that so great a reduction in tlie price of guano, and the 

 advantageous terms upon which it is now offered for sale, will enable 

 you to increase your orders, 



We remain, etc., etc., 



♦ HOBSON, HURTADO & Co. 



To sell raw Peruvian guano, with a guarantee of 10 per 

 cent, of ammonia, or 8.24 per cent, of nitrogen, and from 15 

 to 16 per cent, of phosphoric acid, at the above price, would 

 make it again one of the cheapest and best imported fertilizers. 



B. — Rectified Genuine Peruvian Guano. 



A still more important change in our fertilizer trade, 

 however, is the introduction of the rectified Peruvian guano, 

 which is essentially the same article spoken of in my last 

 report as the soluble Peruvian guano of Ohlendorif & Co., of 

 Hamburg, Germany. 



A few facts regarding the origin of this new fertilizer may 

 serve as an introduction to the subsequent discussions con- 

 cerning the rectified Peruvian guano of Messrs. Hobson, 

 Hurtado & Co., of New York Citv. 



The Peruvian guano was noticed, for several years after its 

 first introduction into the markets of Europe (1840 to 1845), 

 to be of a quite uniform quality ; in the course of time, how- 

 ever, variations in composition became more frequent. 

 Admixtures of stones, pieces of granite from the underlying 

 rocks, and sand from beach washings, pointing towards an 

 exhaustion of some of the guano deposits then worked, 



