
CHAPTER XX 
FINAL DECISIVE EXPERIMENTS 
feast the fluids in the experiments 
recorded in the last chapter were only heated 
to 100 C. for ten minutes, we must not forget what 
the bacteriologist tells us concerning the potency of 
such a temperature for the destruction of Bacterial 
life. A few quotations will make this plain. 
W. H. Park in his ‘ Pathogenic Organisms’ 
(1906, p. 451) says: ‘‘Whenever water is sus- 
pected, and there is any doubt as to the filters, 
it should be boiled for ten minutes; this will 
destroy all bacteria. This precaution should 
always be taken in the presence of typhoid fever 
and Cholera Epidemics.” 
George Newman in “ Bacteria” (1899, p. 81) 
says: ‘There is but one perfectly reliable method 
of sterilising water for household use, viz. boiling. 
As we have seen, moist heat at the boiling-point 
maintained for five minutes will kill all bacteria and 
their spores.” 
Thresh and Porter, again, in ‘“ Preservatives in 
Food and Food Examination” (1906, p. 1), say: 
“Nearly all bacteria are killed when submitted 
to a temperature of about 65° C. for a short 
time, although their spores are not destroyed 
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