576 ON MICRO-ORGANISMS IN TISSUES OF DISEASED HORSES. 



derived from germs which, as contamination, found their way into 

 the capillary tubes, somehow or other, when the sample of blood 

 was collected. Here they grew for some time till the supply of 

 oxygen present was exhausted. It is remarkable that they 

 revived, after four months' imprisonment in the hermetically sealed 

 tubes, on being transferred onto fresh nutrient material. I may 

 mention, without any further going into details of the behaviour 

 of this kind of micrococcus^ that, when some of the original 

 blood containing it, was uniformly distributed in liquefied gelatine 

 (1*5 p.c. grape sugar in it), which was then solidified, colonies 

 made their appearance only at the gelatine-surface, and a little 

 below it ; but here they remained insignificant. Thus this pigment- 

 producing microbe furnishes another example of exclusively aerobic 

 bacteria. 



