A. D. Peacock 
235 
The data of this report have been derived from three sources: 
(1) From surveys made by the writer during the summers of 1915 and 
1916. 
(2) From a survey made by the writer during September, 1918. 
(3) From various collectors, the bulk of whose specimens had been col¬ 
lected during September, 1918, these specimens being identified by the writer. 
SCOPE AND SCHEME OF WORK. 
The main enquiry was commenced on August 30, 1918, and continued 
during the month of September, other duties preventing earlier and later 
investigations. 
In view of the brief period of time available and the lateness of the season 
it was decided that the enquiry should be concerned with ascertaining, firstly 
and most importantly, how widely spread w r ere Anophelines in areas most 
frequented by troops; and, secondly, if opportunity permitted, how high was 
the degree of infestation of any area or areas. In other words it was proposed 
to make a general survey and then, if possible, at least one detailed local 
survey. 
As promising the speediest and most profitable return of information the 
plan followed was that of searching for the Anopheline breeding waters. The 
search for the haunts of the adults, involving laborious work among the dark 
places of rooms, cowsheds, stables and latrines, was regarded as too time- 
consuming and was not pursued. Again, except in a few instances, experi¬ 
ments in rearing larvae and pupae obtained from Anopheline and suspected 
waters, in order to determine the genus of the mosquitoes and the species of 
the Anophelines, were impracticable as also was the identification of the species 
of the Anopheline larvae captured. 
The measure of success attained has depended a great deal upon the 
generous and ready help rendered by various sanitary officers and their non¬ 
commissioned officers and men. Intelligent work in searching for Anopheline 
waters was performed by these non-commissioned officers and men, who, from 
their civilian callings, were well fitted to assist in the investigation. 
The co-operation of officers of the medical service was also invited, an 
illustrated circular and a pro-forma being distributed, the circular indicating 
the objects of the survey and detailing the methods of collection and despatch 
of specimens and information, while the pro-forma was designed to facilitate 
the forwarding of such specimens and information. These were distributed 
from the Office of the Director of Medical Services, Second Army, to all 
Deputy and Assistant Directors of Medical Services, Officers Commanding 
Stationary Hospitals, Casualty Clearing Stations, Mobile Laboratories and 
Sanitary Sections. In certain cases the A.D’s.M.S. repeated the circular to 
Officers Commanding Field Ambulances and to Regimental Medical Officers. 
All the assistance rendered is acknowledged later. 
