685 
such treatment would be safe for human use by the mouth so far as 
tubercle bacilli are concerned. 
It is difficult, if not impossible, to briefly summarize the work of 
others upon the thermal death point of the tubercle bacillus in milk. 
The following table necesarily leaves out many factors : 
Table showing the thermal death point of the tubercle bacillus as found by 
various investigators. 
Investigator. 
Martin, 1882 
May, 1883 
Sormani, 1884 
Schill and Fisher, 1884 
Voelsch, 1887 
Yersin, 1888 
Bitter, 1890 . 
Bang, 1891. 
Bonhoff, 1892 
Gancher and Ledeux-Lebard, 1892. 
Forster, 1892. 
De Man, 1893 ... 
Schroeder, 1894. 
Woodhead, 1895 . 
Marshall, 1899 
Th. Smith, 1899. 
Morgenroth, 1900 . 
Kobrak, 1900 
Beck, 1900 . 
Galtier, 1900 
Russell and Hastings, 1900 . . 
Herr, 1901 
Hesse, 1901 
Levy and Bruns, 1901 
Berthcl and Stenstrom, 1901. 
Bang, 1902 
Tjaden, 1903 
Rullmann, 1903 
Barthel and Stenstrom, 1904. 
Russell and Hastings, 1904 . . 
Zelenski, 1906 
Rosenau, 1907 
Killed at — 
By cooking 
Boiling, 5 minutes 
60°, 10 minutes (—spores) 
60°, 10 minutes (+spores) 
68°, 20 minutes 
70°, 5 minutes (enfeebles) 
60°, 5 minutes (sometimes en- 
feebles). 
80° (sometimes kills) 
85° (always kills) 
60°, 20 minutes 
60°, 5 minutes (attenuates) 
70°, 1 minute (kills) 
J60°, 6 hours 
(95°, momentary 
J55°, 4 hours 
160°, 1 hour 
60°, 15 minutes 
50°, 15 hours 
60°, 8 hours 
60°, 45 minutes 
70°, 45 minutes 
70°, 2| minutes 
68°, 20 minutes 
60°, 15 to 20 minutes. 
55°, 3 hours 
50°, 4 hours 
100°, 3 hours . 
60°, 20 minutes , 
65°, 15 minutes . 
60°, 20 minutes . 
65°, 15 minutes 
85°, 1 to 2 minutes 
65°, 30 minutes 
80°, 1 minute (uncoagulated) 
71°, 1 minute 
60°, 20 minutes 
Not killed at— 
80°. 
90° for 10 minutes. 
100°. 
100°, boiling twice. 
50°, 60 minutes. 
f55°, 3 hours. 
60°, 45 minutes. 
|80°, momentary. 
60°, 45 minutes. 
90° (results contradictory). 
60°, 10 minutes. 
70°, 10 minutes. 
100°, momentary. 
100°. 
80°, 30 minutes. 
85°, 6 minutes. 
80°, 5 seconds. 
70°, 15 minutes. 
60°, 15 minutes. 
60°, 20 minutes. 
80°, 1 minute (coagulated). 
76°, 20 minutes. 
