igoS.l A CRYSTALLOGRAPHIC STUDY OF THE HEMOGLOBINS. 301 



6. Differences betzveen Oxyhcuwglobin and Reduced Hemoglobin 

 in Certain Species. — Undoubted differences between the crystals of 

 these two substances in the same species have been observed. 



We have gathered additional evidence that other corresponding 

 proteins, as well as certain fats and carbohydrates, will be found to 

 exhibit similar specificities. 



University of Pennsylvania. 

 April 23, 1908. 



PROC. AMER. PHIL. SOC, XLVII. 189 T, PRINTED SEPTEMBER 26, I908. 



