47 
It is difficult, if not impossible, to briefly summarize the above 
work. The following table necessarily leaves out many factors: 
Table No. 12 . — Showing the thermal death point of the tubercle bacillus as found by 
various investigators. 
Investigator. 
Killed at — 
Not killed at— 
Martin, 1882 
May, 1883 
Sormani, 1884 
Schill and Fisher, 1884 . 
Voelsch, 1887 
By cooking 
Boiling, 5 minutes. 
Yersin, 1888. 
Bitter, 1890. 
Bang, 1891 . . 
Bonhoff, 1892 
G rancher and Ledeux-Le- 
bard, 1892 
60°, 10 minutes (—spores) 
60°, 10 minutes ( + spores) 
68°, 20 minutes 
70°, 5 minutes (enfeebles) 
60°, 5 minutes (sometimes enfeebles) 
80° (sometimes kills) 
85° (always kills) 
60°, 20 minutes 
(60°, 5 minutes (attenuates) 
[70°, 1 minute (kills) 
Forster, 1892 
(60°, 6 hours 
[95°, momentary. 
De Man, 1893 . . , 
Schroeder, 1894. 
Woodhead, 1895. 
Marshall, 1899. . 
Th. Smith, 1899. 
Morgenroth, 1900. 
Kobrak, 1900 
Beck, 1900 
55°, 4 hours 
60°, 1 hour 
60°, 15 minutes 
'50°, 15 hours 
60°, 8 hours 
60°, 45 minutes 
70°, 45 minutes 
.70°, 2J minutes 
68°, 20 minutes 
60°, 15 to 20 minutes . 
55°, 3 hours 
50°, 4 hours 
100°, 3 hours 
Galtier, 1900 
Russell and Hastings, 1900 . . 
Herr, 1901 
Hesse, 1901 
Levy and Bruns, 1901 
Barthel and Stenstrbm, 1901. 
Bang, 1902 
Tjaden, 1903 
Rullmann, 1903 
Barthel and Stenstrbm, 1904. 
Russell and Hastings, 1904 . . 
Zelenski, 1906 
Rosenau, 1907 
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. 
80°. 
90° for 10 minutes. 
100 °. 
100°, boiling twice. 
50°, 60 minutes. 
55°, 3 hours. 
60°, 45 minutes. 
80°, momentary. 
60°, 45 minutes. 
90° (results contradictory). 
60°, 10 minutes. 
(70°, 10 minutes. 
jl00°, 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. 
The above tabular statement shows that my results agree with the 
work of Yersin, Bonhoff, Schroeder, Th. Smith, Russell and Hastings, 
and Hesse in that 60 ° for twenty minutes is sufficient to kill the 
tubercle bacillus. 
31865— Bull. 42—08 4 
