58 EXPERIMENT STATION. [Jan. 



stance. The nitrogen from this sonree has cost, on the average, 

 26.47 cents per pound. 



Cottonseed Meal. — Forty-three samples of cottonseed meal 

 have heen examined. This has heen the product from six com- 

 panies which have licensed this uiaterial to he sold as a fertilizer 

 in Massachusetts during the past year. This material, like 

 the castor pomace, and linseed meal, is hought largely as a 

 nitrogen source for tobacco. Seventeen out of the 43 samples 

 analyzed show a nitrogen shortage ranging from a few cents to 

 $2.39 per ton. Xitrogen froui cottonseed meal has cost, on the 

 average, 23.(il cents per pound. 



(2) Potafili Compounds. 



Carbonate of Fotasli. — Three samples have heen analyzed 

 and all of them were found to he of good quality. Potash in 

 this form has cost, on the average, 7.08 cents per pound. 



High-grade Sulfate of Potash. — Nine samples have been 

 analyzed and the potash guarantee was maintained in all hut 

 3 of them. The pound of potash has cost in this form, on the 

 average, 5.03 cents. 



Potash-magnesia Sulfate. — Six samples have been analyzed 

 and in every case the potash guarantee has been maintained. 

 The pound of actual j^otash has cost in this form 5.41 cents. 



Muriate of Potash. — Thirteen samples have been examined 

 and only 2 samples have shown a potash shortage, amounting to 

 a few cents per ton in value. The pound of actual potash in 

 form of muriate has cost, on the average, 4.18 cents. 



Kainit. — Three samples have been analyzed, all testing- 

 over the minimum guarantee in potash. The average ])ouiid 

 cost of jiofash from kainit has been 0.13 cents. 



(3) Phosphoric Acid^ Compounds. 



Dissolved Bone Blacl-. — Three samples have been examined 

 and all were found of good quality. The pound of available 

 phosphoric acid from this source has cost, on the average, 7.41 

 cents. 



Arid Phos])haie. — Seven samples have been analyzed and 



