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THOMPSON YATES LABORATORIES REPORT 
Experiment XIV 
Aug. 7 Placed in small cage twelve females fed on blood, with a 
number of males hatched from the same batch of eggs of an 
adult female Anopheles. 
9 Re-fed. 
„ 1 1 Re-fed. 
„ 1 3 Re-fed. 
„ 1 5 Re-fed. 
„ 1 7 Re-fed. 
,, 19 Re-fed; eggs laid, but accidentally lost. 
„ 21 Re-fed ; more eggs laid. 
„ 23 Re-fed two of the remaining three females; the other would 
not feed. The eggs of 21st hatched out. 
„ 25 Re-fed two females. 
„ 27 Re-fed two females. 
,, 29 Re-fed two females. 
Sept. 1 One dead ; the other would not feed — very pregnant. 
,, 3 Re-fed the remaining females. 
,, 5 Dead ; no eggs laid. 
Experiment XV 
Aug. 7 Thirteen females fed on blood of one of us, and introduced into 
cage with a number of males, hatched from a different batch 
of eggs. 
9 Re-fed. 
„ 1 1 Re-fed. 
,, 13 Re-fed. 
„ 1 5 Re-fed. 
„ 17 Re-fed. 
„ 19 One only remaining ; re-fed. 
,, 21 Re-fed the single female. 
,, 23 Eggs laid ; the mosquito dead. 
,, 24 Eggs of 23rd hatched out. 
Thus it does not matter whether the males and females are developed from the eggs 
of a single female or from different females, fertilisation occurs in both cases. 
It was intended to continue these experiments after leaving Bonny, but this 
proved impossible under the circumstances already referred to. 
They prove, however, the following points : — 
(1) That a purely vegetative existence is insufficient for the propagation 
of mosquitoes of the genus Anopheles. 
