1908-9.] MICROCHEMISTRY OF STRIATED MUSCLE. ; 417 
reaction manifested in the latter indicates a diffuse distribution of 
the organic compounds of iron in that structure. 
Since the depth of colour in vicinity of the light band approaches in 
intensity that in the chromatin threads, it is inferred that the amount of 
organic iron in this locality is a little less than in the chromatin. Since, 
however, the material used for this purpose was rather limited in 
quantity it is perhaps best not to insist too much on an interpretation 
of the phenomena observed. 
In conclusion I wish to express my sincere thanks to Professor A. 
B. Macallum, for suggesting the subject of this research, and for his 
supervision throughout the course of the investigations. 
