Report on sleeping sickness in northern Rhodesia to February 1912 / by A. May.

  • May, A.
Date:
1912
Catalogue details

Licence: In copyright

Credit: Report on sleeping sickness in northern Rhodesia to February 1912 / by A. May. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

    27/38 (page 21)
    Oct. 1-1') 17. 15. 2. 22-9 „ 82.89. i(i-;u 19. 10. '9. 2;l;i „ 80.40. Nov. 1-1.0 Iti-JO Dec. 1-1') lo. 2.0 obtai 29. t). ned, all due 9. so far have 42.2 “ hatched.” tt (24-7) tt increased by further hatching to 25.8 days. Mr. Lloyd remarks in this connection “ The table is incomplete in that it does not include the humidity of tlie air which has doubtless as much inliuence as temperature—The break in August and September is due to an attack of ants, which killed the grater number of the flies then in captivity.—Apart from this the number of female flies may be taken as constantly from 100—200. The following facts seem clear. “As the temperature rises (and the air liecomes drier) above the optimum. 1. The number of pufc produced by a given number of females is reduced. 2. A larger proportion of these pupae die. .‘1. The duration of tlie pupation period is reduced. “ These three factors make it difficult to decide what is the optimum temi)erature for the flies. I take it that the optimum would be the temperature at which the pui)ation period is of the longest duration with- out the vitality of the pupaj being reduced.” ]\Ir. Ijloj'd’s deductions on this subject tend to confirm an observation made in Sei)teniber IhJO (i.e. shortly before the beginning of the rainy seiison and when the temperature is probably highest), by Dr. Leach who found when travelling near the Lukasashi River, that not one of many Imndreds of female morsitans examined w;is pregnant. GIm Fuscam Prolonged and careful searcl) in the localities where this was previously reported has resulted in tlie finding of two specimens only, l)oth males. LIST OF CASES OF TRYPANOSOMIASIS IN LUANGWA CLOSED AREA. d’he following cases, which are continued in series from my last re])ort have been fouml since the diite of that report. European. Case No. 29. .1. M. F diagnosed 17th N()veini)er 1910 at Mpika, Previous historj', left Fort Jameson October otli