Restoration of the Silkworm. 303 
The small Chinese monthly worm (B. Sinensis) required in the 
month of June, in the warm climate of Oudh, no more than seven- 
teen days from the hatching of the egg till the formation of the 
cocoon, while, in the cooler temperature of November, fifty-one 
days were consumed. At Mussooree, the same species, hatched 
on the 26th of June, spun the cocoons in twenty-eight days; while 
the Boro-pooloo (B. tertur), which was hatched on the 14th of March, 
began to spin on the 28th of April, consuming thus forty-six days, 
or the same as B. Mori. 
This circumstance, together with the similarity in the marking, 
and the occurrence of black worms in the brood, has led Dr. 
Bonavia somewhat hastily to conclude that the Cashmere worm 
and the Boro-pooloo are one and the same species, an error into 
which he could scarcely have fallen had he given due weight to the 
fact that not only is the worm a full inch shorter than that of the 
Cashmere worm, but the size, colour and texture of the cocoons are 
all totally distinct, and no naturalist could ever confound the one 
with the other. ‘These differences, moreover, are permanent, even 
where the species are cultivated together, and the occurrence of 
black worms merely shows that the Boro-pooloo, like B. Mori, 
has completely lost its constitution. Black worms are also occa- 
sionally found in the broods of the Nistry (B. Creest), which is 
undoubtedly distinct. 
If, then, we unite all the species under the one name of Bombyx 
Mori, we shall find that the time consumed from the hatching of 
the egg to the spinning of the cocoon will vary in the same climate 
from seventeen to forty-six days, a circumstance which is alone 
sufficient to point out the incorrectness of such an arrangement : 
while if we more reasonably insist upon there being several distinct 
species now confounded together, the difficulty at once vanishes, 
and the difference at present observable is satisfactorily accounted 
for. 
I shall, therefore, now proceed to unfold my views on this 
subject, and show, from the peculiarities observable in each 
species, upon what grounds I insist upon specific distinction. 
1. Bomsyx Mort, Linn. 
Synonymes. 
Phalena Bombyx Mori, Linn. 8. N. 1, 2, p. 817 (1767); Ameen. 
Acad. iv. p. 563; Faun. Suec. p. 832; 
Aldrov. Ins. p. 280; Albin. Ins. pl. 
12, f. 16; Reaum. Ins. ii. p. 5, f. 2; 
Reesel. Ins. iii. pl. 78. 
