AGRICULTURAL EXPERIMENT STATION. 6 



different places, there seems to be little chance that the average 

 composition of the samples analyzed is materially unlike the 

 average of the goods offered for sale. This statement receives 

 support from the fact that there are seldom any important varia- 

 tions in the composition and valuation of the three samples, and 

 moreover the results of one year's inspection are generally practi- 

 cally in accord with those of other years, which would not be the 

 case if the system of taking samples was inadequate to accom- 

 plish the desired purpose. 



METHOPS OF ANALYSIS. 



Through the efforts of the Association of Official Agricultural 

 Chemists uniform methods of fertilizer analysis are in use by 

 experiment stations and official chemists, these methods being 

 such as have been found by severe and extended tests to be 

 reliable. The results of our best laboratories are now found to be 

 in accord within the ordinary limits of error, a condition of things 

 which is a great improvement over former years, and which is 

 highly beneficial to all parties concerned. 



THE TRADE VALUES OF FERTILIZERS FOR 1889. 



The trade values given below which are used by this Station are 

 those "agreed u^Don by the experiment stations of Massachusetts, 

 New Jersey, Pennsylvania and Connecticut for use in their 

 respective states during 1889. The valuations obtained by use of 

 the following figures will be found to agree fairly with the average 

 retail price at the large mai'kets of standard raw materials such 

 as:" 



Sulphate of Ammonia, Azotin, 



Nitrate of Soda, Amaionite, 



Dried Blood. Dry Ground Fish. 



Muriate of Potash, Bone or Tankage. 



Sulphate of Potash. Ground So. Carolina Rock, 



Plain Superphosphates. 



Cts. 

 per lb. 



Nitrogen in ammonia salts 19 



nitrates 17 



Organic nitrogen in dry and iiue ground tish, meat and blood 19 



in cotton seed meal and castor-pomace 15 



in fine bone and tankage 104 



in fine medium bone and tankage 13 



in medium bone and tankage lOh 



in coarser bone and tankage S-i 



in hair, horn shavings and coarse fisli soiap 8 



