96 THOMPSON YATES LABORATORIES REPORT 
on the ceiling of the staircase, and on the ceiling and walls of the kitchen. In the 
other less-used and more cleanly-kept rooms none could be found. The visit was 
made about mid-day. 
On the 5th of May,* at a farm near Chester, one female and two males, 
Anopheles bifurcatus, were captured in the laundry in the dusk of the evening. An 
examination of other parts of the farm was unsuccessful, except in the cellar, where 
the crowd of Culex was found to have left the wall, and had collected near the only 
possible exit (a fine wire grating of perforated zinc in the wall) where myriads had 
been killed in their endeavours to escape. 
The Anopheles caught on the 23rd of April* we firmly believe to have 
hibernated during the winter months, and at that time were developing ova for the 
first time this year, having frequently during the winter and early spring months 
examined many farms in this district. 
* The figures below give the mean daily temperature for each week throughout March, April, and May, in this district. 
For week ending 
March 
4 2 '3 
F. 
14 . - 
43.1 
F. 
i» 
2 1 
3 8- + c 
F. 
28 
35-8' 
F. 
April 
4 
4 1 '5 
F. 
* 
1 1 
45' 2 ~ 
F. 
18 
44-2 
F. 
2 <! 
57-0' 
F. 
May 
49" 5 
F. 
9 
49-9 
F. 
16 
S2-i 
F. 
2 3 
S4-8 C 
F. 
31 (S days) 
5 8- 4 c 
F. 
