THE COMPARATIVE EFFECTIVENESS OF CERTAIN 
CULICIFUGES UNDER LABORATORY CONDITIONS. 
By A. BACOT, 
Entomologist to the Lister Institute of Preventive Medicine , 
and Private G. TALBOT, R.A.M.C. 
(With 1 Text-figure.) 
CONTENTS. 
I. Introduction ......... 
II. The choice of Mosquito ....... 
III. Method of rearing ........ 
IV. Conditions found necessary to maintaining the stock . 
V. Details of preparations tested ...... 
VI. A discussion of the preparations tested .... 
VII. Methods adopted for testing preparations .... 
VIII. Experiments, Series I, and discussion of results 
IX. Experiments, Series II, and discussion of results 
X. Comparative efficiency of the preparations tested 
XI. The behaviour of the Mosquito in the presence of the Culicifuge 
XII. Variation in attractiveness of different hosts 
XIII. Summary of results ........ 
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I. INTRODUCTION. 
The methods and experiments detailed in the following paper were devised 
for the purpose of determining for the War Office the comparative efficiency 
of certain Culicifuges, the work being carried out at the Lister Institute of 
Preventive Medicine. 
Any preparation which will repel the attacks of mosquitoes, if only for a 
short period, is a desideratum in countries where these insects abound. In the 
case of soldiers in malarious countries, an effective culicifuge would be of 
great importance, as troops are necessarily exposed to risks not incurred by 
civilians, as, for instance, outpost and sentry duty at night, which debars the 
free use of mosquito curtains and at the same time restricts freedom of move¬ 
ment. In our opinion the experimental results obtained are sufficiently 
promising to justify their publication, together with the methods by which 
they were attained, in the hope that future work on these lines will establish 
a scientific basis for the use of culicifuges. 
The bulk of the preparations were made up by Messrs Burgoyues from 
formulae collected bv the War Office; these include Nos. 1-fi, 9 a , 15 a and lb. 
