Marks , employed for classifying the Schizomycetes. 14 1 
(/ 3 ) Colonies circumscribed, without branches. 
(i) Bacilli large — 2*5 /x broad. 
Bacillus megaterium. 
(ii) Bacilli not more than 1 broad. 
* Developing Clostridium forms before sporifi- 
cation. 
Clostridium butyricum , &c. 
* No Clostridium forms. 
Bacillus mesentericus vulgatus , &c. 
B. Colonies or substratum coloured. 
(a) Colouring-matter red. 
Bacillus prodigiosus , &c. 
(/ 3 ) Colouring-matter green. 
Bacillus fluorescens-liquefaciens , &c. 
(y) Colouring-matter violet. 
Bacillus violaceus. 
III. The organisms will not grow on nutrient gelatine, and only 
on other media at higher temperatures, and in the presence of 
air. 
Bacillus tuberculosis. 
B. mallei \ &c. 
IV. Organisms anaerobic — i. e. will not grow in presence of air. 
Bacillus tetani. 
B. butyricus , &c. 
V. Organisms described in the tissues, but will not grow under 
ordinary conditions in cultures outside the body. 
Bacillus Leprae , &c. 
3. The organism is a Spirillum. 
(i) Gelatine liquefied. 
Spirillum c holer ae-asiaticae, &c. 
(ii) Gelatine not liquefied. 
Spirillum rubrum , &c. 
(iii) Not yet cultivated on artificial media. 
Spirillum Obermeieri , &c. 
This leads me to the enunciation of a suggestion which I 
think might occupy the attention of experts at the next 
Hygienic Congress, and might, it seems to me, guide us to a 
