316 Captain T. Hutton’s Characters of 
mutations and does not thrive well. This might be obviated by 
keeping the room warm, but we should be thrown out by the want of 
leaves, the mulberry putting on its wintry garb of bare branches.” 
This information was kindly furnished from the Radnagore 
district, but it is equally applicable to all others in India, the time 
occupied from egg to cocoon varying always with the temperature 
in which the worm is reared, being, as with the other species, more 
rapid in a high than in a cold temperature, as witness Dr. 
Bonavia’s experiments in Oudh, seventeen days in June and fifty- 
one in November. 
Mr. Blechynden’s remarks as to the worms thriving better in 
summer than in winter tend to support my opinion that the monthly 
worms belong naturally to the more genial temperature of the 
south, while the annuals only belong to the colder mountainous 
regions of the north. It is also said of this worm that “ yellow 
cocoons will produce insects that give white silk, but that insects 
from white cocoons never produce yellow.” Here then is a cor- 
roboration of my previous argument that white is a sign of de- 
generacy and weakened constitution. 
From what has already been said, then, I think ample proof has 
been furnished of the existence of at least six species of domes- 
cated Bombyces, instead of one as heretofore supposed. 
Before passing on to a consideration of the wild species I would 
say a word respecting the hatching of the eggs of B. Mori for a 
second crop: at Mussooree, where this was first observed, we have 
in effect what may be termed a double season, or two springs, so 
that when after the rainy season the temperature falls back to from 
68° to 62°, the eggs will again begin to hatch. I have observed 
this both in B. Mort and B. textor, but I am inclined to think that 
it will only occur with worms in a transitional state, that is to say, 
before they have become acclimatised ; and that as soon as this has 
been effected the irregular hatching may be expected to cease. 
For three years my worms of selected b. Mori, or the dark kind, 
have given a second crop; but the very attempt to cause them to 
revert may have had some effect in unsettling them, for the white 
variety | have never found to yield a second brood. With 
B. textor the same thing occurred, and for three or four years they 
continued to give an autumnal crop; this year, however (although 
B. Mori is now in September hatching in a temperature of 68°), 
the Boro-pooloo remains unhatched, although in previous years 
the hatching commenced about the 22nd of August, a full month 
earlier. I expect, therefore, that B. Mori will eventually likewise 
settle down again into an annual, That the hatching is in some 
