144 ROTARY PROPERTIES OF SOME PROTEIDS. 



It is worth noting that the specific rotations of the annual 

 and vegetable globulins, so far as known, lie between 38 

 and 48, or perhaps within still closer limits. Besides those 

 studied by the writer, the specific rotation of serum globulin 

 is 48, that of fibrinogen lies between 45 and 50, and 

 we have good reason for believing that that of egg globulin is 

 about 40. 



In conclusion, the writer desires to acknowledge his indebted- 

 ness to Prof. R. H. Chittenden and Dr. L. B. Mendel, of the 

 Sheffield Scientific School, for assistance and suggestions hi 

 the preparation of the proteids and their solutions ; the success 

 of this investigation is due in a large measure to their able and 

 hearty co-operation. And also to Prof. C. S. Hastings, of the 

 same institution, in whose laboratory the polarimeter observa- 

 tions were all made. 



