(ah 2) 
&c., because it also extended to larve of a moth caught in 
the woods. He exhibited specimens of illustraria illustrative 
of the extremes in size and colour yet attained by him; there 
were forms, in both sexes, of a chestnut colour with few 
markings on the upper surface and of a bright orange 
beneath. This showed an advance in colouring, but not a 
very great one, on the original stock bred from, which 
showed considerable variations both in colour and in intensity 
of marking. The experiments next described were as to the 
effect of cold on the pupa. Out of 174 pupa, offspring of a 
single pair, 89 were subjected, for a fortnight in July, toa 
steady temperature of 83°-34° Fahr. The moths of which the 
pupe were so treated showed a noticeable but not great dark- 
ening of hue, and, in the females especially, there was a 
tendency to the contrast between the dark inner portion 
and the light outer portion of the wings, which is so marked 
a feature in the spring emergence. Some pupe which had 
been kept at a forcing temperature in the autumn of 1887, 
produced moths considerably lighter in their colour than 
some of the same batch which were exposed to the open air from 
Noy. 7th to Jan. 1st. Out of another batch of some 50 or 
60 pup obtained by Mr. Jenner from eggs laid in the spring, 
two of which emerged as moths in July, the rest showing no 
signs of emerging, some were lent by Mr. Jenner for experi- 
ment, and were forced from Sept. 10th; eight or nine came 
out at various intervals from Sept. 27th to Oct. 19th; these 
were intermediate between the spring and summer colouring, 
and showed an almost regular darkening in colour according 
to lateness in emerging. Mr. Merrifield said that so far the 
results of experiment were quite in accordance with those of 
Prof. Weissman and others, but other experiments seemed to 
show that the temperature to which the larva in its growing 
stages was exposed had much to do with the colour of the 
perfect insect. Forty eggs of EF. alniaria (now autumnaria) 
were forced, and forty eggs from the same source were 
sleeved. From the former 29 moths appeared, in an average 
period of about 46 days; from the latter 25 were reared, in 
an average period of over 90 days, these last having been 
brought indoors before several of the later ones pupated, and 
