58 EXPERIMENT STATION. [Jan. 



stance. The nitrogen from this sonrce has eost, on the average, 

 2G.47 cents per ponnd. 



Cottonseed Meal. — Eorty-tliree samples of cottonseed meal 

 have been examined. This has been the prodnct from six com- 

 panies which have licensed this material to l)e sold as a fertilizer 

 in Massachnsetts dnring the past year. This material, like 

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

 nitrogen sonrce for tobacco. Seventeen ont of the 43 samples 

 analyzed show a nitrogen shortage ranging from a few cents to 

 $2.30 per ton. Nitrogen from cottonseed meal has cost, on the 

 average, 23.61 cents per ponnd. 



(2) Potash Compoiiiuls. 



Carbonate of Potash. — Three samples have been analyzed 

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

 this form has cost, on the average, 7.68 cents per pound. 



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

 analyzed and the ])otash guarantee was maintained in all but 

 3 of them. The ponnd 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 ponnd of actual potash has cost in this form 5.41 cents. 



Muriate of Potasli. — Thirteen samples have been examined 

 and only 2 samples have shown a jiotash 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 pound 

 cost of potash from kainit has been 6.13 cents. 



(3) Phosphoric Acid Compounds. 



Dissolved Bone Blacl\ — Three samjdes 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. 



y\cid Phosjiliate. — Seven sann)lcs have been analyzed and 



