500 Bacilli in Gut of Insect during Metamorphosis. 
The infection of the controls in these latter experiments 
is, I suggest, due to organisms that either resist the 
sterilising agent, or are protected from it for a period by 
the varnish or wax, and are then released by a shrinkage 
or partial peeling of the varnish, or wax, covering. 
OcToBER 21, 1911. 
