Die Parasiten der Infectionskrankheiten. _ 299 
körperchen sind in ihrer Gestalt sehr verändert. Sie sind oft 
stark geschrumpft, stets mit Fortsätzen versehen, die entweder 
lang, fast wimperartig sind oder die Form sehr kleiner Ausbuch- 
tungen haben (B. C. Fig. 7 Taf. VI). An der Basis der längeren 
Ausbuchtungen sieht man häufig einen Coccus. Die Cocci bilden 
stets Vacuolen, die man oft sehr deutlich als umgebende Höfe 
wahrnimmt (A, B, C, F. Fig. 7. Taf. V1). 
Amerikanische Rinderpest (Figur 8 Taf. VI). 
Ueber diese merkwiirdige Krankheit berichtete mir zuerst 
Herr Professor Elisha Harris in New-York am 22. Sept. 1868 
Folgendes: 
Dear Sir, 
Permit me the privilege and honour to mention to you a 
discovery made by my assistant in pathological researches, under 
this sanitary Board, in the Malignant Score of Cattle that have 
become infected by Texas herds. 
This Epizootic suddenly burst forth „par explosion“ in the vast 
droves of fat beef cattle in the Western prairies about one month af- 
ter the arrival and intermingling of 40,000 wild cattle from Texas. 
I my earliest investigations I sought for Phytozoa or micro- 
phytes in all tissues and the blood and bill of the diseased cattle 
when slaughtered or dead. 
My work rewarded in the discovery of a simple form of 
spore-growth, which at first, we supposed to be a cryptococcus 
of some kind. And it was necessary to resort to your erudite 
brochures upon the parasitic Microphytes to ascertain what ground 
we were upon. 
I now believe that we have a cryptococcus modified in some 
Way spices vote It is so important that very exact scientific resear- 
ches be pursued in regard to this mycological mystery and this 
deadly epizootic, that I beg you to inform me if any pupil or 
expert coworker of yours is accessible to me in America that he 
may assist and advise in this study. 
All our efforts at culture are yet imperfect. From the rab- 
bits that have been killed by feeding on the bill of the diseased 
bullocks I have only obtained the cryptococcus gut. 
I will endeavour to forward specimens of bill to you. 
With great regard! 
Cor. Sec. 40 Reg. Elisha Harris M. D. 
