124 JOURNAL OF THE [November, 



of the deadly cholera germ, or the germ of typhoid fever. When 

 they resemble the poisonous varieties they must be separated 

 from the others, isolated, cultivated, and not until after they 

 have undergone long and careful study and experiment can 

 judgment be pronounced as to the salubrity of the water in which 

 they were found. 



Compared with its vital importance, very few satisfactory re- 

 sults have yet been reached in the study of Bacteriology. But 

 it is a new subject, and the keen intellects now pursuing it will 

 doubtless before long illuminate many parts of it which are at 

 present shrouded in uncertainty. 



