: Ailanthiculture. 231 
an imago emerged on August 20th, an interval of thirty-six days in 
pupa. My second batch of eggs were laid June 6th, 7th; these 
hatched out June 23rd, and commenced their cocoons July. 30th, 
an interval of only twenty-eight days; from these the imagos 
appeared August 23rd, &c., an interval of thirty-four days in 
pupa. The fact of a larva feeding up in the short space of twenty- 
eight days from the egg to the cocoon is remarkable, and due to 
the facts that not only was the weather very warm, but the larvee 
were kept under glass at a temperature of 90° to 100° for the 
purpose of hastening their changes and obtaining a second brood. 
A hundred and one cocoons were obtained for the purpose of 
attempting a second brood; of these thirty-six pairs were fer- 
tile; the first hatched out August 2Ist, the last September 21st : 
eggs were laid August 23rd up to September 7th, in all 8,438: 
the first batch of larvae hatched September 7th up to September 
19th. Of these eggs about 8,000 were placed out on the trees in 
the nursery and remained there till after the second moult of the 
larvee, when they were transferred co the larger Ailanthery by the 
railway side; out of the 8,000 about 3,250 were taken down; some 
were sent away as specimens, and of the youngest lot of 620 none 
were removed, as I wished to watch them at home; these larvze 
throve well and grew rapidly till they approached their last 
moult, when on October 10th stormy and cold weather set in, heavy 
rains followed, and many of the larvae were dashed down. Their 
growth seemed stopped, they became torpid and would not feed ; 
and on the 20th seeing that the weather continued cold, windy 
and wet, and that many were likely to perish, | brought into the 
house the remainder of the larva. Of these very many never 
“recovered; the rest were fed up to the 10th November with 
Ailanthus leaves, and subsequently with celery leaves: those 
which had not been knocked off the trees soon came round: 
they did not however thrive, the leaves soon withered and seemed 
devoid of juice, and it was quite plain that [ was just from 
fourteen to twenty-one days behindhand. Up toa certain point 
all had gone well, but with the setting in of stormy autumnal 
weather all hope of acrop was lost. On the 24th October the first 
cocoons were commenced, and in all about 400 cocoons were ob- 
tained; these however are much smaller than and altogether in- 
ferior to those of the first crop, and worthless for reeling. 
I gather from this experiment that it would be hazardous to 
depend for a crop upon eggs laid later than August 10th, but that 
there is a fair chance of success with all eggs laid up to that date: 
after the stormy weather set in on October 10th, the sap seemed 
