Table IV. Gypsum or Land Plaster. 



Name of Manufacturer and Brand 



United States Gypsum Co., 300 West 

 Adams St., Chicago, 111. 



Ben Franklin Agricultural Gypsum (3) 



Calcium Oxide 

 (CaO). 



Found. 



32.64 



Guar- 

 anteed. 



30.00 



Note: Moisture found, 18.36%; insoluble matter, 1.35% 



Calcium Sulfate 

 (CaS0 4 ). 



Found. 



67.51 



Guar- 

 anteed. 



64.50 



Calcium and 



Magnesium 



Carbonates 



Found. 



9.98 



L. A. Howard and G. D. Howard, Proctorsville, Vermont 

 Howard's Agricultural Talc 



Magnesium oxide 

 Calcium oxide 

 Iron and aluminum oxides 

 Insoluble silica 



30.49 

 2.47 

 7.04 



51.28 



* Guarantee of acid soluble magnesium oxide, 13.00%. 



Soluble in strong 

 By Fusion Hydrochloric-Nitric 

 Percent Acid 



Percent 



8.03* 

 1.21 



Guarantee 

 Percent 



31.00 



Publication of this Document approved by the Commission on Administration and Financb 

 2500. l-'39. No. 6120. 



