124 



HATCH EXPERIMENT STATION. 



[Jan. 



less of this substance, provided the entire material is finely 

 ground and the price in accordance with the composition. 



We advise farmers to buy cotton-seed meal, like all other 

 fertilizing materials, on the basis of a guarantee of (at least) 

 nitrogen as the basis of the bargain. For their information 

 it seems but proper to state in this connection that the 

 American Cotton Oil Company of New York has quite re- 

 cently secured a license for the sale of their cotton-seed meal 

 as a fertilizer in our State, and intend to sell on the basis of 

 the amount of nitroaen their article contains. 



5. Notes on Damara Land Guano. 



The material which served for our examination was sent 

 on to this office by Messrs. H. J. Baker & Bro. of New York 

 City. It consisted of a bag containing two hundred pounds 

 of guano, and was accompanied by analyses of two chemists 

 of London, Eng. As every new source of a genuine guano 

 claiming to resemble the Peruvian guano of earlier periods 

 in the trade of commercial fertilizers must be of special im- 

 portance to all interested in the temporary resources of our 

 supplies of plant food, our results are briefly stated below : — 



Analysis of Damai-a Land Ouano {Per Cent.'). 



Moisture at 100° C, 17.70 



Organic matter, . . . . . . .25.63 



Total ash, 56.67 



Total nitrogen, . . 5.79 



Nitrogen in form of animoiiiates, . . . .1.80 



Nitrogen in form of nitrates, . . . . . .05 



Nitrogen in form of organic matter, . . . 3.94 



Carbonic acid, trace 



Total phosphoric acid, 14.78 



Soluble phosphoi'ic acid, 4.90 



Reverted phosphoric acid, . . . . .5.79 



Insoluble phosphoric acid, 4.09 



Total jjotassium oxide, 3.53 



Potassium oxide soluble in water, . . . .3.46 



Sodium oxide, 7.03 



Calcium oxide, 14.21 



Magnesium oxide, . . . . . . .2.05 



Iron and aluminum oxides, trace 



Sulphuric acid, . . . . . . . .5.94 



Chlorine, 5.77 



Insoluble matter, . . . . . . .9.26 



