Pari passu with the separation, and discovery of new bacilli, knowledge of their method of development, their habitat and peculiarities accumulates. Straus and Dubarry have in corroboration of the experiments of Bolton, Wolffhügel and Riedel, come to certain definite conclusions regarding the viability of certain now well-known pathogenic germs. They have found the bacillus anthracis alive in water after the 16th, 24th, 28th, 65th and even as late as the 131st day.
The bacillus of typhoid fever lives from 30 to 81 days.
They found the bacillus of Asiatic cholera alive at 16, 26, 30 and 39 days—but it should be remembered that Wolffhügel and Riedel found this microbe alive in river water after 7 months.
The bacillus of tuberculosis was found living at 24, 25, 27, 30, 75, and 115 days, but it was also demonstrated that the virulence of this bacillus became attenuated after a long sojourn in