Abstract
Recent pathologic studies of typhus fever, especially by German and Russian workers, have shown that in this disease the nervous system is not only involved with remarkable constancy, but is even involved more than any other part of the body. Because of the rarity of typhus in this country, American contributions on its pathology in general and that of the nervous system in particular are lacking. To Dr. J. Tarassewitz of Moscow, Russia, I am indebted for the brain of one case, and to Dr. E. K. Piette of Kharkov, Russia, for a number of paraffin blocks from two cases of typhus fever. In addition, I had the opportunity, during my stay in Russia last year, to study a number of stained sections and to secure a number of valuable contributions in the Russian language.1 As the brain changes in typhus fever are those of an acute encephalitis, it

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