oU 



AXl.MAI. THYl'ANOSOMIASKS IN I'HK A.Nli LO- i:<i Yril AN SUDAN 



4. Carrier. Thu carrier of this tiypaiiosoiiiu is iioi duliiiitfly known, biting tiius ami 

 ticks have been suspected; they both abound in those regions where tliis disease is prevalent. 

 T). Reaction to tlnnjs. No experiments iiave Itecn performed. 



.\1iir|ihoU)gy 



liioculaliun^ 



Tvi'K I 

 T. rtvax or cazalbuui (I'hile 1., lig. 4) 



No living strain has as yet been available for investigation in these laboratories. 

 Dr. Halfoiir lias described tlie occurrence of this tyi)r nnder the heading of " Cattle 

 Trypanosomiasis of Kassala " in the Tliiid Kcpoit. From a consideration of its 

 morpliology in the stained specimens which have been available, we have decided to class 

 this type as above. As so little is known wu shall give its characteristics in all brevity. 



\\\ general, resembles very closely the type specimens of 7'. n'rax as depicted by vaiious 

 observers, showing the well-known characteristic shape. 



Liiiijth. Variations in length are apparently not marked. 



TYl'E i. T. ciciix ur Cdzulhoai 



HreaJlh. — From 2 to 2-5 microns. lUjtoplcufiH. Clear staining cell contents, rarely 

 granular. Nucleus. — Long and oval, situated towards the anterior extremity. 

 MicroHuc.leui'.' -Large, round, and terminal or sub-terminal. Fiidulaionj uuniihraiie. — 

 Unfolded and well developed. i'7(;;/c///(;;/.- -Free, from about ',\ to o mici'ons. 



Animal inoculations are known to affect cattle and supposed to be very virulent to 

 sheep and goats in .\byssinia. Tlie insusceptibility of smaller animals to this tyjjc lias 

 been the cause of our ditticulty in obtaining a living strain. 



3. Culturi'. This species is said to grow readily so tluit we are in hopes of soon being 

 successful in this direction. 



4. (Jarricr. Supposed to be a Tabanin' or llippohtiscu. 

 i). Jicaclioii (u (/(•«;/.•>•. Nothing is known. 



We liave now com))leted our present classitication into four tyjies, but, doubtless, we 

 shall shortly find need for amplification and modification in the classes as worked out here. 



Captain .\i fliil)alcl is, at the time of writing this ])a))(T. proceeding to the Lado with 

 the object of obtaining and working on the strains of that district, and, as he is taking 

 up the floating laboratory and is well provided with experimental animals, we have good 

 reason to hope for the most fruitful results. 



In conclusion, I have to thank most sincerely Colonel Sir 1 )avid Bruce,C.B.,F.R.S.,A.M.S., 

 for his extremely kind help and advice as to the treatment of the animal trypanosomiasis 

 of the .\nglo-Egyptian Sudan and for the use of liis charts and measurements of which 

 this paper is so largely made up, and l^ady Bruce for the excellent Trypanosonie Plate. 



I am indebted to ^lajor StaTidisli (J'Crady and Captain W. R. O'Farrell, H..\.M.C., 

 for great assistance in making drawings from microscopic specimens and in other 

 directions. Mr. George Buchanan's work in these laboratories speaks for itself in 

 this Report. 



