6 Scientific Proceedings, Royal Dublin Society. 
100 freezings, with about a dozen different Bacteria—saprophytes, 
and plant and animal pathogenic forms. Their results are 
summed up as follows:—‘“ The former idea that Bacteria in 
general are not harmed by freezing is untenable. It was based 
on qualitative tests, which are incapable of showing the true state 
of affairs in the exposed culture. Probably an enormous number 
of Bacteria are destroyed by every winter, and those which 
survive come through in the form of endospores or some other 
resistant shape.” 
I desire to express my indebtedness to the Royal Dublin 
Society for the liquid air required for these experiments, and 
especially to Mr. R. J. Moss, r.1.c., F.c.s., for his assistance in its 
manipulation. 
