Pedigree Moth-breeding. 133 
(eges not in the forcing-box till the first eggs were about 
to hatch), the larval period ranged from 26 to about 59 
days; the pupal period seems to have been about 12 
days. After the early alarm they were kept rather 
cooler than the preceding forced generation had been, 
as, with the advent of cooler weather, I found it difficult 
to keep up a high temperature without making the 
bottom of the forcing-box very hot. The average size 
had again risen on that of the preceding generation. 
On 28rd October I paired off 6 couples, keeping them 
in the forcing-box, and 4 of them were fertile. The 
largest pair laid 170 eggs (called M 2, A 1), the medium- 
sized 210 (called M 8), the smallest 80 (called M2, Z 1). 
Lifth generation.—About 86 of the first, 169 of the 
second, and only 24 of the third hatched. The numbers 
are now about 82, 151, and 21 respectively. I am 
feeding them up on rose and evergreen honeysuckle, 
and the most forward are nearly full-grown, as will be 
seen by the living specimens I[ exhibit. I have made an 
improvement in my forcing-box, so that I can keep up a 
more equable temperature without danger of roasting 
those which are near the cistern, and I keep it at about 
70° to 80°. 
InLuNARIA.—General results.—Without venturing any 
opinion on many of the questions suggested by an 
examination of the facts above detailed, until more 
facts have been accumulated, I may advert to a few of 
them. It seems to be established that S. dlunaria 
forces well, and there is evidence that the average size 
of forced specimens is larger than that of the insects 
reared on growing trees, and tends for a time to increase 
from generation to generation, notwithstanding close 
interbreeding. Iam not satisfied that the fertility has 
been diminished by the process of forcing ; but it does at 
present appear as if extremes in size, especially in the 
direction of smallness, have a tendency to be sterile, 
and I think it prudent to select the breeding pairs from 
some point quite short of either extremity in the scale 
of size. There is another fact established as to the 
summer broods of illwnaria,—-all of which that I have 
reared, I need hardly say, are in appearance of the 
summer type, Juliaria,—viz., that, in accordance with 
the usual rule with the Geometre inhabiting this 
