44 FERT1LIZEKS. 



OTHER SOURCES FOR NITROGEN. 



Peruvian Guano, Sulphate of Ammonia, Nitrate of Potash, Nitrate of Soda, 

 Castor-Pomace, Azotin, Ammonite, Tankage, Dried Blood, Cotton-See?. 

 Waste, Hoof and Horn Shavings, and Leather- Waste. 



(An analysis of the above will be found in the table on pp. Ill, 112.) 



As this treatise is to be for the most part confined to 

 those sources of crop-food, which, by way of contrast with 

 barnyard and the more common class of manures, are 

 called "fertilizers," I will not go into details relative to 

 several of the sources from which nitrogen may be obtained^ 

 as this would make my treatise too extensive. If the public 

 should appear to desire a more extended work, containing 

 other manure resources, I may write it at a future day. 



At the head of fertilizers, as distinguished from barn 

 manure, stands guano. This may be defined as rotten 

 sea-bird dung, with the remains of birds mixed with it. It 

 is found on thousands of islands, but only on a few of these 

 in large quantities. Being manure of birds that feed on 

 fish, it would always contain the same manure elements 

 as fish, but that the rain dissolves and washes out the 

 ammonia, leaving but the phosphate behind. Near Peru r 

 however, there are a few islands lying in a region 1 where 

 no rain falls ; as what would otherwise be the rain-bearing 

 wind for the region loses all its moisture by the time it 

 passes over the high, dry tops of the lofty Andes Moun- 

 tains. These islands yield a guano rich in ammonia. 

 There are several kinds of guano in the market, known as 

 Rectified, Guaranteed, Standard, Lobos, Navassa, Carib- 

 bean^ etc. The first three named are varieties of the 

 Peruvian (sometimes also called Chincha, or'Guanape, to 

 designate the localities from which they were obtained), all 

 rich in ammonia, Standard containing nine to ten per 

 cent, Lobos five to five and one-half, and Guaranteed six to 



