ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



379 



gland of the groin, and in the pns a few plague organisms ; cultures 

 therefrom proved virulent for guinea-pigs. (7) The liability to con- 

 fuse the Bacillus j)estis with such germs as those of chicken-cholera, 

 rabbit septicaemia, swine plague, pneumopleurisy of calves, etc., is 

 insisted upon by the author. He holds that the Microscope alone is 

 incapable of distinguishing between these bacilli, and that it is only by 

 bacteriological investigations and by testing the virulence and behaviour 

 •of the bacillus experimentally in animals that a definite and conclusive 

 diagnosis can be made. 



(2) Preparing Objects. 



Apparatus for the Automatic Fixation of Embryos.*— L. Sanzo 

 describes an apparatus which he has devised for the purpose of automa- 



Fig. 68. 



tically fixing embryos at any desired stage of development. The 

 •essential points are a clockwork motor and a special kind of stopcock or 

 tap (fig. G8). The drum B which contains the motor is surmounted by 



* Zeitschr. wiss. Mikrotk., xxi. (1904) pp. 449-57 (4 fig6.). 



