ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 297 



In a further communication * the author describes the morphogenic 

 action of a high degree of salinity. The bacilli, instead of disarticulat- 

 ing, increase in length, become filamentous, and occasionally are trans- 

 formed into Spirilla. 



Citrate of Soda and Agglutination of Bacillus typhosus.! 

 A. Sartory and P. Lasseur record the results of an investigation to 

 ascertain if the presence of citrate of soda accelerates or retards the 

 agglutination of B. typhosus. They find that citrate of soda alone has 

 no agglutinating effect ; that citrate of soda added to fresh serum 

 has no marked agglutinating action ; that when a serum has a feeble 

 agglutinating power, citrate of soda seems slightly to mask the results 

 by increasing a little the rate of agglutination. 



Morphologioal Variation of Mycoderma vini.f — R. Perotti con- 

 cludes from numerous experiments that varying concentrations of 

 glucose, diversity in the sources of carbon, different concentrations in 

 the nitrogenous compounds, the acidity and the amount of alcohol in 

 the nutritive media determine notable morphological variations in the 

 cells of Mycoderma vini. 



These variations affect the dimension and shape of the cells, which 

 decrease or double in size. They may be elongate, bacilliform, round, 

 cocciform, or may be rounded off at one end and elongated at the other. 



* Comptes Rendus, clx. (1915) pp. 608-10. 



t C.R. Soc. Biol. Paris, lxxviii. (1915) pp. 36-8. 



J Atti R. Accad. Lincei, xxiii. (1914) pp. 423-6. 



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