INFECTIOUS DISEASES AND MICROBES, ETC. 203 



of the funnel, the gelatine becomes liquefied, and 

 this liquefaction gradually extends in breadth, and 

 always in depth, along the line of the growth. The 

 liquefied part of the gelatine is clear, and at the 

 bottom of it is a whitish precipitate. 



In stab-cultivations, using agar-agar or solid 

 blood serum as the medium, white dots make their 

 appearance in the streak; but these are of a 

 brownish colour where thickly packed together. 

 On the surface of agar-agar or solid blood serum 

 a continuous film is formed. 



In alkaline bouillon the growth forms whitish, 

 fluffy, or loose masses at the bottom of the tube. 

 In milk M. scarlatinas grows fairly well, and turns 

 the milk at first thick, then quite solid ; sometimes 

 this occurs after two or three days' incubation at 

 37 C., sometimes a little later. 



Drs. Klein and Power have proved that a certain 

 eruptive disease of the teats and udders of cows 

 is capable of communicating scarlatina to human 

 beings through the medium of the milk derived from 

 such cows. 



In certain extensive outbreaks of scarlatina at 

 Hendon, Wimbledon, etc., Dr. Klein found Micro- 

 coccus scarlatince in the blood of scarlatina patients 

 both during life and after death ; and he found the 

 same microbe in the tissues and organs of persons 

 dead of scarlatina. These outbreaks of scarlatina 

 were traced by Power and others to the milk-supply 

 from certain farms where the cows were suffering 

 from what is now known as cow -scarlatina. In 

 both human and bovine scarlatina the same microbe 



