400 Ascaris suum 
CONCLUSIONS. 
1. Catalase may be better determined by the new method 
given in this paper than by the method used by Burge. 
2. There is five-eighths as much catalase in the body wall of 
Ascaris suum as in the visceral organs, and one-fourth as much 
in the body fluid as in the visceral organs. 
3. There is three times more catalase in the body wall of 
Ascaris suum than in the leg muscles of Rana pipiens, if one uses 
the amount of the catalase in the reproductive organs of each 
form as the units of measurement. 
4. On the basis of this last statement it can be assumed that 
there is more than enough catalase in the body wall of this para- 
sitie worm for its metabolic and locomotory functions, and hence 
it is possible that this excess is used to liberate oxygen for pro- 
tecting the parasite against the digestive enzymes of its host, if 
Burge’s theory be true. 
BIBLIOGRAPHY, 
Burge, W. E., Relation between the amount of catalase in the different 
muscles of the body and the amount of work done by these muscles, 
Am. J. Physiol., 1916, xli, 153. 
Burge, The effect of phosphorus poisoning on the catalase content of the 
tissues, Am. J. Physiol., 1917, xliii, 545. 
Burge, W. E., and Burge, E. L., The rdle of nascent oxygen in regulating 
the erie of enzymes in auiiiale and plants, Am. J. Physiol., 1914, 
xxxlv, 140. 
Burge and Burge, The protection of parasites in the digestive tract against 
the action of the digestive enzymes, J. Parasitol., 1915, a, i, 179. 
Burge and Burge, The rate of oxidation of enzymes and their correspond- — 
ing pro-enzymes, Am. J. Physiol., 1915, b, xxxvii, 462. 
Burge, W. E., and Neill, A. J., The effect of starvation on the catalase 
content of the tissues, Am. J. Physiol., 1917, xliii, 58. 
Dox, A. W., The catalase of molds, J. Am. Chem. Soc., 1910, xxxii, 1357. 
Weinland, E., Ueber Antifermente, I and II, Z. Biol., 1903, xliv, 1, 45. 
