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From (1) it follows that antitoxin destruction may take place with or without protein splitting. 3. In solutions containing trypsin and 0.5% sodium carbonate the results were the same as in (2). 4. Tetanus antitoxin in 0.2% hydrochloric acid was completely destroyed in three or more days. During this time no significant chemical changes in the proteins were detected. 5. In neutral solutions pepsin did not affect the antitoxin. 6. In pepsin-hydrochloric acid, proteolysis and antitoxin destruction proceeded simultaneously. These results tend to indicate that tetanus antitoxin is a substance of non-protein nature. But the stability of the antitoxin is so dependent upon that of the protein to which it is attached, that whenever the protein molecule is split, the antitoxin splits with it. The experimental details are given in the Journal of Agricultural Research, 1918.

Tests for Fluorine and Tin in Meteorites with Notes on Maskelynite and the Effect of Dry Heat on Meteoric Stones