88 REVIEW. 



microscope. The phenomena thus observed were similar to those 



Fig. 2. Bacilli anthracis from the blood of a guinea-pig; crystalline 

 rods, some beginning to divide transversely, or to get bent, with blood- 

 corpuscles {a, white, b red), x G50. Koch's drawing. 



indicated by the different stages of development which have been 

 just detailed. 



The spores of Bacillus anthracis under certain conditions of 

 temperature, nutrition, and presence of air develope immediately 

 to the Bacilli, which were seen in the blood. 



The impression that this is really the state of things, and that 

 the spores are not merely broken-down products of the bacillar 

 fibres, is supported on a priori grounds by the natural history of 

 Fungi and Algse, and was confirmed by the injection of spores 

 alone into the blood. Placed in a drop of aqueous humour each 

 spore was seen to take an oval shape, and to become imbedded 



I @ ^ 



#. 



^ 



X ^650 



Fig. 3. Growth of the spores. The spore is elongating into a cylin- 

 drical corpuscle, the highly refractive mass remaining at one pole, gets 

 smiiller, breaks up, and finally disappears. 



