ANIMAIj trypanosomiases in the ANQLO-EGYrTIAN SUDAN 



55 



Liiljoi'atories {jnujus 119, 120). Wliile these were not done according to Brace's method they 

 are suflSciently accurate for all practical ijurposes. The fading of the old films has 

 rendered satisfactory re-measurement impossible. We have, however, made use of the 

 chart showing curves of distribution in respect to length of T. nanum, Uganda, 1909, 

 and Balfour's T. nanum, Sudan, 1904, as represented in the Proceedings of the Royal 

 Socieh/, B., Vol. 83, 1911. (Col. Sir David Bruce and others.) The second curve 

 mentioned was prepared from slides supplied by Dr. Balfour in the summer of 1910. 



Type 3. Chart copied from the Proceedings of the Boyal Society, B., Vol. 83, 1911. 



/^' 10 II 12 13 14 16 16 17 18 19 20 21 22 23 



^' ISolia line — /'. nanum, Li^anda. 1909 



Animal Inoculations and Eeactions 



The following experiments were performed by Dr. Balfour, and are detailed by him in 

 the Second Eeport of the Laboratories {pages 120, 121) : — 



These inoculations were carried out with the trypanosome from the same cattle strain 

 of which the slides were sent to Laveran, who gave this trypanosome its title of " nanmn." 



These experiments are, as Dr. Balfour himself confesses, quite inadequate to furnish 

 any exact idea of the pathogenicity of this trypanosome to laboratory animals. 



Attention is drawn strongly to this point because monkeys, dogs, rats and mice 

 have all been shown to be susceptible to T. pecorum of Uganda ; and if, as it would apj)ear 

 above, these animals prove insusceptible to T. nanum on further experiment, we shall 

 be forced to create new types or at least make one sub-division. However, until we can 

 carry out more detailed and extended experiments on these points we shall class these 

 possibly various strains of trypaiiowomes under the heading T. nanum, or pecorum, 

 regarding the niorphnlogical reseiiililaiices as sufficient justification for so doing. 



3. Cidlure. No experinieiits have as vot been undertaken in this country to attempt 

 to cultivate any strain of this type. 



