viii] MICROCOCCI 163 



Agar mixture, or potato, and herein differs materially from 

 the ordinary cocci occurring in pus. Bumm has proved 

 that the gonococcus grows only on blood-serum, and Loffler 

 and Krause have also succeeded in . growing it on serum. 

 In streak cultures on moderately solid blood-serum kept at 

 32" C, well moistened, the gonococcus, accordingto Bumm, 

 grows in the form of a thin, narrow, greyish-yellow film 

 1-2 mm. in breadth, with smooth and moist-looking surface. 

 The growth does not proceed for more than a few days and 

 then dies. Animals are refractory against the gonococcus 

 or the gonorrhoeal secretion ; dogs, rabbits, monkeys, horses, 

 show no reaction, neither on the conjunctiva nor on the 

 urethra. Eumm has, however, succeeded in producing in 

 the human subject real gonorrhoea by inoculating, from a 

 culture of the gonococcus, the urethral mucous membrane. 

 There can be no doubt about the fact that the gono- 

 coccus, which, as mentioned above, grows well on serum, is 

 peculiar to gonorrhoea and cannot, therefore, be confounded 

 with other pus micrococci. Probably Neisser's gonococcus 

 was only a pus coccus, since it grew also on other media. 



