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Nutritional ill-health
354
CORRESPONDENCE
I cannot explain these contradictory results, but the position now seems to be that wettable powders of D D T may have some fumigant effect upon Anopheles (and perhaps also a slight repellent effect since the two seem to go together except with citronella), but that this effect is not due to their p,p D D T content. A fuller account and discussion of these results will appear in the
Bulletin of Entomological Research. I am, etc., J. A. REID,
Entomologist. Instkute for Medical Research, Kuala Lumpur. 17th August, 1950.
NUTRITIONAL ILL-HEALTH. SIR,--Dr. HUGH M. WOODMAN,in his letter to you (Transactions, 1950, 44, 231) has, I think, misinterpreted the conclusions in my paper entitled " A survey of signs of nutritional ill-health among the Azande of the southern Sudan." I agree wholeheartedlywith his and Dr. LORENZEN'Sconclusion that the Azande " exhibit few proved signs of the deficiency diseases " ; also that they " are better off than most tribes in Central Africa." Nevertheless, I submit that the results of my survey show that " signs commonly ascribed to nutritional ill-health are exceedingly common " among them. Whether or not these signs commonly ascribed to nutritional ill-health are, in fact, so caused is a question which will only be answered after many more surveys correlating clinical signs with dietary intake, and nowhere in my paper have I suggested that all tile signs mentioned are of proved value as evidence of an inadequate diet. I am, etc., P. H. ABBOTT. 74, King's Road, Richmond, Surrey. 14th October, 1950.
printed in Great Britain by II. R, GRUB~ LTD., Croydon
CORRESPONDENCE
I cannot explain these contradictory results, but the position now seems to be that wettable powders of D D T may have some fumigant effect upon Anopheles (and perhaps also a slight repellent effect since the two seem to go together except with citronella), but that this effect is not due to their p,p D D T content. A fuller account and discussion of these results will appear in the
Bulletin of Entomological Research. I am, etc., J. A. REID,
Entomologist. Instkute for Medical Research, Kuala Lumpur. 17th August, 1950.
NUTRITIONAL ILL-HEALTH. SIR,--Dr. HUGH M. WOODMAN,in his letter to you (Transactions, 1950, 44, 231) has, I think, misinterpreted the conclusions in my paper entitled " A survey of signs of nutritional ill-health among the Azande of the southern Sudan." I agree wholeheartedlywith his and Dr. LORENZEN'Sconclusion that the Azande " exhibit few proved signs of the deficiency diseases " ; also that they " are better off than most tribes in Central Africa." Nevertheless, I submit that the results of my survey show that " signs commonly ascribed to nutritional ill-health are exceedingly common " among them. Whether or not these signs commonly ascribed to nutritional ill-health are, in fact, so caused is a question which will only be answered after many more surveys correlating clinical signs with dietary intake, and nowhere in my paper have I suggested that all tile signs mentioned are of proved value as evidence of an inadequate diet. I am, etc., P. H. ABBOTT. 74, King's Road, Richmond, Surrey. 14th October, 1950.
printed in Great Britain by II. R, GRUB~ LTD., Croydon