
PART IV 
COMPLICATED METHODS AND CONFLICTING 
RESULTS 
CrinPTE RXV 
PROFESSOR TYNDALL’S EXPERIMENTAL EVIDENCE 
WITH HEATED ORGANIC FLUIDS 
lie 1875 Professor Tyndall began to work at this 
subject, and announced his results early in the 
following year.!. He did not endeavour to ascertain 
the lowest temperature which would prove de- 
structive to Bacteria, Torula, and their germs, 
though he came to the conclusion that they were 
always killed by being boiled for five minutes in 
organic fluids, and he seemed to imply that this 
result was irrespective of the precise degree of 
acidity or neutrality of the fluids employed.? Since 
this conclusion as to the death of ferment organ- 
isms and their germs in infusions raised for a few 
minutes to 212. F. was based upon about 500 
experiments with fluids of the most varied nature, 
Professor Tyndall seemed to feel considerable con- 
1 Philosophical Transactions, 1876, pt. i. p 27. 
2 206.62. Di bY 
211 
