A Sterile Putrescible Fluid. By W. H. Ballinger. 293 
conditions, sterile. Moreover, difference of size affects tlie length 
of time taken by the germs in falling through the air. As all this 
is so entirely in accord with the facts presented by Professor 
Tyndall in relation to supposed bacteria germs, it appears to me to 
greatly enhance the probability that the supposed germs are such, 
although we have not yet discovered how they are produced, and 
although the microscope is unable to detect them. 
