142 THE CONTAGIOUS TYPHUS 



been given in a masterly manner by the 

 veterinary physicians of the different European 

 countries, especially by those in which oppor- 

 tunities to observe it have been most frequent 

 that is to say, by the Russian, German, 

 and French veterinary doctors, Jessen, Rool, 

 D'Arboval, Gelle. 



The English physicians of the 1 8th century, 

 as we have already seen, were also in no respect 

 inferior to those of our own time. Finally, 

 Mr. Simonds, who published a very able 

 Report on his return from his scientific explo- 

 ration in Galicia, in 1857, and the skilful 

 Professor Bouley, in his recent communica- 

 tions to the Academie de Medecine, in Paris, 

 respecting his examination of the present cattle 

 typhus in England, have described the disease 

 with minute exactness, as we ourselves have 

 verified on the various sick beasts which we 

 have seen during the last two months. 



1. Period of Incubation. Several careful 

 experiments, which have been cited in the 

 historical division of this work, and numerous 

 fortuitous occasions, have authorized us to 

 assign a duration of nine or twelve days to 

 the period of incubation, according to the 



