T. B. Magath 397 
that the amounts of gas determined by this method will be less 
than those made according to the Burge method, and Tables II 
and III indicate this in the case of frog tissue, run at the same 
time on tissue taken froin the same frog, which had been washed 
free from blood by running 0.75 per cent sodium chloride through 
the blood system. It will be seen that the ratio between my 
Fra. 1. 
method and Burge’s is 1: 1.52 in this case. A Schiff’s azotom- 
eter has been used for catalase determinations (Dox, 1910). 
By the method described determinations of the catalase con- 
tent of the whole worm, the body wall, body fluid, and visceral 
organs were made. It should be recalled that the body wall of 
these worms consists of an outer, inert, non-cellular cuticula, a 
thin layer of subcuticula, and inside of this a single layer of 
muscle cells. The visceral organs consist in adult females, which 
