222 
THE EVOLUTION OF LIFE 

Professor Tyndall’s position is such as to render a 
careful discussion, even of his isolated work, ex- 
tremely interesting. 
It is perhaps to be inferred from 
the emphasis with which Professor Tyndall restricts 
1 
















a 5 ae 
Fic; 2%, 
Professor Tyndall’s Experimental 
Chamber. 
his statements to purely 
liquid infusions, that he 
has gone over and con- 
firmed Bastian’s turnip 
and cheese experiments, 
but he did at one time 
(whatever he may do 
now) maintain that no 
purely liquid infusion, 
whether acid or alkaline, 
could putrefy if boiled 
and protected from the 
contact of atmospheric 
dust. His experiments 
were conducted in two 
series, one described in 
a lecture at the Royal 
- Institution early in 1876, 
published in a more 
mature form in_ the 
Transactions of the Royal 
Society for that year ; and 
the other in a lecture 
delivered at the Royal 
Institution on the 19th of January of the present 
year, a report of which appeared in the Bretzsh 
Medical Journal of January 27th. 
“The general method employed was to cement a 
