246 THE AMERICAN MONTHLY [Aug. 



The material gatheri^d from difi'erent parts of the lake 

 by means of any of this apparatus ought to be conserved 

 each in a different way. If only the outward habitat of 

 the different animal species forms the object of our study, 

 then ir will usually be sufficient to put the material in 

 alcoliol of 30-50°. This proceeding leads to a satisfac- 

 tory result only when we have to deal with animals of 

 greater resistance, such as rotatoria, Crustacea, nematoda 

 and protozoa. On the contrary, animals with a soft 

 body, as protozoa with a thin shell and tubellaria as well 

 as those with a harder shell must, if we want to examine 

 them anatomically, be treated with certain chemicals 

 before placing them into alcohol. The treatment with 

 sublimate gives in every respect good results. We pour 

 a solution of sublimate over the material filtered out and 

 into the water containing the material. By this means 

 the animals are killed suddenly, but their texture is con- 

 served to a certain degree. This being done, we filter 

 the sublimate or water containing the sublimate and sub- 

 stitute alcohol first of 30°, then of 50° and finally of 70°. 



Bacteriology of Influenza. 



By J. D. WHITLEY, M. D., 



I'ETERSIUTEG, ILL. 



A number of Bacteriologists have made careful 

 researches during the extensive epidemic of 1890, 1891, 

 and 1892. In 1892, a bacillus was discovered by Pfeiffer 

 and by Canon of Berlin, which according to Sternberg, 

 there is good reason to believe is the specific cause of the 

 disease. 



Pfeiffer infers that this bacillus is the specific cause of 



Influenza in man for tlie following reasons : First. They 



were found in all uncomi>licated cases of Influenza 



examined, in the characteristic purulent bronchial secre- 



ion, often in absolutely pure cultures. They were fre- 



