I9I3] 



Marston Lovell H amiin 



411 



taken as silica; this amounted to 0.5 per cent. of the ash, The 

 calcium sulfate weighed 0.0326 gram, which represented 0.0134 

 gram of calcium oxide, er 3.8 per cent. of the ash. Of the filtrate 

 diluted to 500 c.c, two portions of 200 c.c. each were taken for the 

 determination of magnesium and phosphorus. In one, 0.1052 gram 

 of magnesium pyrophosphate represented 0.0671 gram of phos- 

 phorus pentoxide, or 48.2 per cent. of the total ash. In the other 

 0.0798 gram of magnesium pyrophosphate represented 0.0289 grarn 

 of magnesium oxide or 20.7 per cent. of the total ash. 



To test for manganese^ 5.000 grams of the oil-free powdered 

 kerneis were ignited as above and the ash taken up with 4 c.c. of 

 nitric acid Solution (sp. gr. 1.20) and water, and this liquid filtered. 

 It was diluted to 20 c.c. and a 10 c.c. portion was boiled with 0.5 

 gram of lead peroxide for several minutes, the precipitate allowed 

 to settle, and the liquid decanted into a test tube. Next a Solution 

 containing 20 milligrams of manganous sulfate per 5 c.c. was 

 diluted with nitric acid Solution and water to fifty times its original 

 volume, and treated in the same way. It was found that the Solu- 

 tion of the ash was matched in color by a Solution 1/700 as concen- 

 trated as the original manganous sulfate Solution; therefore 5 grams 

 of the kernel powder contain 4 X 20 X 1/700 milligrams of man- 

 ganous sulfate, or 0.000028 gram of manganese, which is 0.00056 

 per cent. The results are summarized below : 



These results indicate that the cold-pressing and ether extraction 

 in my own work removed substance amounting to about half the 

 weight of the kernel. 



'Noyes, Bray and Spear: Tech. Quart., 1908, xxi, p. 116. 

 'Schulze and Godet: Z. f. physiol. Chem., 1908, Iviii, pp. 156-61. 



