2a2 Dr. Wallace on 
to stagnate in the leaves and no longer to afford a proper nutri- 
ment. It may not be uninteresting to mark the ratio between 
the eggs placed on the trees in the nursery and the larva taken off 
when half-grown: 
Eggs. Larvee, 2nd moult passed. 
Lots 1, 2, 3 685 384 sent down to railway. 
4, 608 328 N.B.—The proportion sent 
a down will be seen to de- 
5 815 185 crease regularly as the 
season advanced; some 
6 576 245 were given away, and 
~ Po) about 270 more sent down 
ts 805 420 which could not be pre- 
8 1.602 515 cisely allocated to any 
qi particular group. 
9 1,017 406 
10 1,175 380 
1] 600 120 
12 620 None. 
8,003 2,983 
Deduct, not sent down .......-. 620 270 sent down but not allocated 
to any particular lot. 
Totalese1 te 2578885 3,253 
Thus rather more than one-half perished. 
The first and main crop was, however, a decided success ; 
18,678 eggs were reserved, beginning July Ist to 22nd; these were 
hatched out in the nursery, and the larve retained there til] half- 
grown, and then transferred to the Ailanthery by the railway side ; 
other eggs were placed on different trees in neighbours’ gardens. 
The larve began to hatch out July 13th, 14th; the first cocoons were 
gathered August 24th, and continued to the end of September, but 
even up to the middle of December a few cocoons were newly 
observed and harvested: in all, 5,368 cocoons have been cathered 
from the railway bank, and 197 from the gardens, generally very 
large and fine: and from some there have already emerged moths 
of finer appearance and expanse than their parents. A boy was 
employed as conservator at Gd. per day to keep down weeds, 
transfer larve, pick up those on the ground, and keep birds off, 
if necessary ; but the last work was superfluous, as, with the ex- 
ception of a thrush once observed ‘in the Ailanthery, no birds were 
seen to frequent it. In this experiment the great loss seemed, as 
I have before stated, to occur in the egg and young larval states, 
and again at the last moult ; the former loss, which is necessarily 
the greatest, is the least in importance, it being always easy to 
provide many more eggs than are required for cocoons, and the 
amount of foliage consumed by the young worms is so trivial as 
