1912.] A Camel Trypanosoma. 565 



noticed that the disease is rapidly fatal to rats and monkeys, while in dogs it 

 -is relatively slow :— 



Table III. 



Expt. No. 



Source of 



Incubation 

 period. 



Duration of 

 disease. 



Remarks. 



*Oxl23 



Camel 8 



days. 



days. 

 112 



Trypuiiosomes never seen in 

 peripheral blood ; proved 

 by subiuoculation. 



Alive after 130 days ; not 

 showing by direct observa- 



*Mule 6 



Dog 3 



5 





* „ 25 



Donkev 22 



Dog 3 

 Donkey 13 

 Camel 8 



? 



136 



*Donkey 13 



*Dog 3 



8 

 8 

 11 



99 

 128 

 68 





* „ 5 



Ox 123 

 Dog 3 



10 

 8 



40 





* „ 6 



21 





* ., 14 



Mule 6 



7 



34 





*" 21 } 



* „ 671 J 



* „ 29 



10 

 7 



" { 



62 

 83 



Alive after 150 days ; some 

 emaciation ; no corneal 

 changes. 



* „ 30 



Donkey 22 

 Dog 671 



Monkey 676 



Dog 671 



Goat 677 

 Dog 671 





White rat 696 ... 



697 .. 



674 ... 



675 ,.. 

 780 ... 



Goat 677 



4 



4 

 4 

 3 

 3 

 ? 

 ? 



26 



10 

 10 

 10 

 5 

 14 



Old monkey at commence- 

 ment of the experiment. 



Trypanosomes never seen in 

 peripheral blood. Alive 

 and in good condition after 

 110 days. 



Guinea-pig 



4 



4 



85 

 70 



Identity of the Trypanosoma— The diagnosis appears to rest between the 

 trypanosomes of the surra-nagana group, e.g., T. brucei, evansi, equiperclum, 

 and cquinum. The well marked kinetic nucleus seen in stained films excludes 

 T. equinum, and the absence of any of the characteristic plaque lesions of 

 dourine is against T. equiperdum. 



There remain T. brucei and T. evansi to be considered. The following curve 

 constructed from Table I corresponds roughly to Bruce's curve for T. evansi, 

 and the absence of any short stumpy forms from all the experimental animals 

 examined is against T. brucei. Thus out of 400 specimens measured in the 

 present instance no trypanosomes were seen measuring less than 18 //, in 

 length, while Bruce describes a considerable number of examples of T. brucei 

 between 13 fi and 17 ft. Turning to the table of animal reactions little or no< 

 assistance is forthcoming in deciding between T. brucei and T. evansi. In 



