56 THE CONNECTICUT AGEICULTURAL 



963. Preston Sons' Dried and Ground Fish Guano contains 

 rather less phosphoric acid and very much less nitrogen than is 

 usually found in dried fish scraps. 



The average cost of the samples analyzed (excepting 963) is 

 ^45,33 per ton, the average estimated value $45.32, 



Nitrate of Soda. 



928. From stock of Mapes' Conn. Valley Branch, Hartford, 

 stated not to be on sale in Connecticut. 



941. Quinnipiac Fertilizer Co., New London. From stock of 

 Wilson & Burr, Middletown. Sampled by J. M. Hubbard, Mid- 

 dletown. 



Analyses. 928 941 



Nitrogen, 15.48 15.46 



Equivalent nitrate of Soda, 94.00 93.90 



Cost, $70.00 67.00 



Nitrogen costs per ] 00 lbs., $22.61 21.67 



Sulphate of Ammonia. 



929. Sulphate of Ammonia from stock of Mapes' Connecticut 

 Valley Branch, Hartford. Stated not to be on sale in Conn. 



1018. Sulphate of Ammonia from Mapes F. & P. G. Co., New 

 York. Sampled and sent by Michael Donovan, South Windsor. 



Analyses. 929 1018 



Nitrogen, 20.74 20.34 



Equivalent sulphate of ammonia, 97.78 95.70 



Cost per 100 lbs., -. $4.75 4.75 



Nitfogen costs per 100 lbs.. $22.90' $23.35 



Both samples were of good quality. 1018 had a slight bluish 

 tinge, due probably to the presence of a trace of cyanogen com- 

 pounds insoluble in water. It contained no soluble cyanogen 

 compounds [cyanides or sulphocyanides.] The soluble cyanides 

 are poisonous to vegetation if applied in considerable quantity, 

 but it is likely that their poisonous quality has been somewhat 

 over-estimated. Maercker* found that one per cent, of ammoni- 

 um sulphocyanide in a superphosphate did no damage, and 89 lbs. 

 of it to th-e acre did not injure oats. Schumann on the other hand 

 found that 178 lbs. per acre did serious injury to grass land. 



* Centralblatt Ag. Chem., 1883, p. 497 



