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The result of two days at Polegate and Tilgate was detailed, 
when 50 males were attracted by one female, and settled on a 
gauze-covered box, 11 at the former and 39 at the latter, in each 
case against the wind, and between 2.30 and 4 o’clock. A series 
of experiments last year with the Oak Eggar Moth were also 
detailed. 
Now, the question naturally arose, by what sense were these 
creatures attracted? It could not be by sight, for the females 
were in a box on the side of a slope, and the males flew across the 
valley and close to the surface of the ground. When trying 
similar experiments with other species, a field with a wood at the 
end was selected, and the males were seen flying over the tops of 
the trees. If it were by smell, then the odour, to us quite imper- 
ceptible, is wafted to enormous distances. 
Another very natural question arose: did the same state of 
things prevail with other insects? To a certain ascertained extent 
it did, and, doubtless, the list of known examples might be 
extended, if experiments were tried. In the case of the Apterous 
and Semi-apterous moths, such as Orgyia, Cognostegma, and 
many others, the females hardly move from the place where they 
emerge,—nay, some of the Vaporers even lay their eggs on the 
empty cocoon, and there is little to wonder at in the males seeking 
their society ; but with those species which possess the power of 
very rapid flight, the fact of the females remaining stationary and 
quiet is very remarkable. 
This peculiarity has long been known to British entomologists, 
by the older of whom, such as Barbet, Moses Harris, and 
Haworth, it is termed ‘‘ sembling.” 
Examples of ‘‘ sembling” with the Lappet (G. Quercifolia), 
Convolyulus Hawk (S. Convolvuli), Satin Moth (P. Salicis), and 
the Lackey (P. Neustria), were described, and it was stated that 
other examples could be given to prove the point that this power 
of ‘‘sembling” was not confined to one family of moths. Those 
who had the time and opportunity should try experiments with 
females of each family, and see whether the same law did not pre- 
vail, more or less, with all. Several male butterflies may often be 
seen round one stationary female ; and last autumn, wishing to 
diminish the tipule daddy-longlegs, he (Mr. W.) instructed his 
