246 THE INSECT WORLD. 
the missionaries. It is much to be desired that this species may 
be acclimatized in Europe. 
Figs. 224 and 225 represent, after drawings in the memoir of 
M. Guérin-Méneville, already referred to, the cocoon and moth of 
the Attacus pernyi. 
The silk which Attacus Mylitta produces is perhaps superior to 
that of Pernyi. When the cocoons are properly prepared, the 
silk can with ease be wound off from one end of them to the other. 
This worm is found in various parts of Bengal and of Calcutta, and 
also at Lahore, and its silk is exported in considerable quantities 



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Fig. 225.—Attacus (Bombyx) pernyi. 
under the name of twsseh. Brownish stuffs are made of it in India 
of firm and bright texture, which are used for summer clothing, 
or for covering furniture. 
Figs. 226 and 227 represent the moth and the cocoon of Attacus 
Mylitta after M. Guérin-Méneville. 
In 1855, M. de Chavannes reared this species in the open air, 
near Lausanne, in Switzerland. ‘This treatment succeeded per- 
fectly, without any degeneration, for many years. It, however, 
died out at last, from the effects, perhaps, of too great a difference 
in the climate, or from those accidents, still so little understood, 
to which even the insects of our own country are subject. This 
was unfortunate, as this species is one of those whose accli- 
matization in Kurope is the most to be desired, for it would render 
great service to the cultivators of silk. 
