28 



THE PROTEINS OF THE WHEAT KERNEL. 



strongly indicating that the P 2 O 5 was derived from the nucleic acid. These 

 calculations gave the results shown in table 3. 



TABI,E 3. Composition of leucosin contained in the preparations from water 

 extracts of the wheat embryo. 



Of these preparations, 6, 7, 8, 9, 18, 19, 20, and 21 were obtained by coagu- 

 lation with heat, 10 and 15 by coagulation with alcohol, 13 and 16 by satu- 

 ration with sodium chloride, n, 12, 14, and 17 by dialyzing salt solutions 

 in water, and 22 by direct dialysis of the aqueous extract. Since some of 

 these preparations formed a large part of the protein contained in the extract, 

 while others represented fractions of it, it is evident that all contain pro- 

 tein of the same composition, mostly combined with various proportions of 

 nucleic acid. 



Eliminating the nucleic acid, it thus appears that the composition of the 

 protein part of those preparations which contain phosphorus is the same as 

 that of the phosphorus-free protein preparations, although the former con- 

 tain from very little up to more than 37 per cent of nucleic acid. 



Most of these preparations might, in accordance with custom, be called 

 nucleoproteids, while 13 and i6are, both in properties and composition, very 

 much like nuclein. It is probable that these nucleoproteids and nucleins are 

 nucleic acid compounds of one and the same protein. 



It is to be noted that these preparations show very diverse properties. 

 Some are like albumin; some like globulin; some are precipitated by satura- 



