Epidemic among Ammals. -59 



I believe, however, that there are other methods of iransmission, 

 and. in particular, I cannot overlook the fact that animals live near 

 the docks, where the fl} also is found, whereas the infection is 

 greatest in marshy areas. 



The disease has been [produced experimentalh in ihe Bacterio- 

 logical Institute. 



Young cattle withstand huge doses, and while the parasites ap- 

 pear in the blood the animals manv months later are still in good 

 health. 



A pig has entirely resisted inoculation. 



Two goats were inoculated with large doses without showing 

 infection of the blood microscopically, nevertheless, the blood of 

 these goats .served to produce the disea.se in clean dogs inoculated 

 with it. 



Pigeons entirely resist infection. 



Guinea-pigs shew great differences in resistance, some dying 

 after a few weeks, others living for months. 



Rabbits behave somewhat similarly, but death is almost certain 

 to occur in these animals with great emaciation shewing itself pre- 

 viously, and in many cases a i)rogressive panophthalmitis is found. 



In horses, dogs and rats and mice the malady runs a \ery acute 

 course. Horses which have been " salted '' to horsesickness are as 

 susceptible as clean horses. From the point of view of its in- 

 fectiveness it is not vet clear that its affinities are either with the 

 Tset.se parasite or the Surra. 



