4o6 Phosphorus Content of Starch [April-July 



held by the starch granules why should all of it be precipitated with 

 the starch while other ash constituents are not so reprecipitated ? 



If our assumption that the starch of Sample F is all in chemical 

 combination with phosphorus is correct, then we might estimate the 

 molecular weight of starch from the proportion 0.0153 : 31 = 100: 

 x^ to be about 200,000. 



These observations extend the work, under Dr. Gies' guidance, 

 which was lately reported by Mattill.^ 



3 Mattill : Biochem. Bull., 1913, ii, p. 553. 



