CHAP. V THE A UTUMNAL DISEASE 45 



this observation which led me to re - investigate 

 the microbes obtained from the spring grouse, for of 

 them I had in my earlier communications on the 

 subject stated that they are non-motile. On re- 

 investigation, I ascertained that this is not so, that in 

 every specimen made of the cultures there are some 

 individuals which show mobility, but the number of 

 which, as stated above, decreases in older cultures, and 

 which are absent in recent potato and broth cultures. 



The bacteria in the blood are, as a rule, more 

 rod-shaped than those taken from the lung, though 

 also in the blood some are spherical or slightly oval ; 

 the rods are also here commonly arranged as dumb- 

 bells -(Fig. 22). 



Cultivations made with a drop of the blood in 

 gelatine plates, or by rubbing a droplet of blood over 

 the slanting surface of solidified nutrient gelatine, 

 show, after 24-48 hours, innumerable colonies ; the 

 slanting surface of the gelatine is so covered with 

 them that, having become in many places confluent 

 by proximity, they form an almost continuous film. 

 As regards the character of the microbes in cover- 

 glass specimens, fresh or dried and stained, made of 

 the cultures, these microbes are identical with those 

 derived from the lung, both of the spring grouse 

 and of the autumn birds, and there is nothing to 

 specially add to what has been stated in a former 



