132 Mr. F. Merrifield’s Report of Progress in 
The hatching (not forced) lasted about 3 weeks, the 
larval period 18 or 20 days, the pupal 8 or 10 days. 
The moths were larger than the sleeved ones, but not so 
large as those that were bottled. On 8rd July I paired 
off two of the largest (A), 5 of medium size (M), and 
2 of the smallest size (Z); and from all of these, except 
one M and one Z, I had fertile eggs, which I bred from 
as follows :— 
Third generation (eggs not placed in the forcing-box 
till earliest of them about to hatch).—The 8 broods did 
not vary much in their rate of progress—the M’s were 
2 or 83 days behind the A’s, the Z’s 2 or 3 days later 
still: the larval and pupal periods together were about 
the same as in the second generation. From 205 A 1 
eges I bred 68 male and 61 female moths, together 129, 
six cripples; from 115 M1 eggs, 35 males and 53 females, 
together 88, one cripple; from 107 Z1 eggs, 16 male 
and 14 female moths, together 30, 3 of them cripples, 
and two so weakly that they died before they could be 
paired: many of the Z1’s died as larve. The A 1’s 
comprised the largest I had yet bred; I did not average 
them: the M1’s (averaged by taking every alternate 
one of each sex in the order of emergence) were slightly 
larger than the average of the preceding generation : 
the Z1’s considerably smaller. I paired off 4 of the 
largest couples among the A’s, 4 average couples of the 
M’s, and 10 couples of the Z’s. None of the A’s or Z’s 
laid a fertile ego: 3 out of the 4 M’s laid fertile eggs, 
and from one of these pairs, paired 16th August, I had 
210 eges, which I bred from as follows :— 
Fourth generation, M 2.—These were not only slower, 
but straggled more in their feeding up and emergence 
than the earlier forced generations had done. The first 
spun up 23rd September; by 8th October nearly half 
had done so; and on the lst November all had done so 
except two, which soon after died. Many larve died in 
pupating, and a few before. I have some reason to 
think this was owing to their having been made too 
hot at one time. The first moth appeared 2nd October ; 
by the 38rd November 60 were out, and on the 7th the 
last appeared ; but 3 or 4 are still in pupa, one or two 
of them certainly being alive. 386 are males and 25 
females; 3 were cripples, and 3 more died before they 
were paired off. The hatching occupied about 10 days 
