340 
ON THE PRODUCTION OF 
ticated, that is to say, reared in the magnanerie, and, 
instead of being able to circulate freely on the 
branches, inevitably somewhat crowded together, it 
becomes a matter of necessity to facilitate the means 
of feeding. For the same reason the silkworm, which, 
on the tree, sustains with impunity the effects of 
pelting rain or burning sun, being able to take shelter 
under the leaves if it feels disposed, which, by-the-bye, 
it, does not always do, cannot endure with impunity 
the rain or sun in the magnanerie. 
The magnanerie, established in the manner de- 
scribed above, gives free access on all sides to the 
surrounding air ; the silkworms can be protected from 
the direct rays of the sun, from the rain and violent 
winds, and the needful attention can easily be bestowed 
on them. 
Educators in the open air must not be hasty in their 
operations ; the worms must be set to hatch only when 
the mulberry has put forth abundant shoots and there 
is no cause to fear severe cold. In the latitude which 
I inhabit, about two miles from the Jura, I do not 
hatch my silkworms before the beginning of June, 
which is likewise the epoch when the worms reared on 
the tree begin to make their appearance. In a warmer 
climate and a less variable temperature there would 
doubtless be no objection to the hatching process being 
left to take place naturally in open air ; indeed, I think 
it would be preferable. But in the central and 
northern parts of Europe, and especially in the neigh- 
bourhood of mountains, this would be almost impossi- 
ble. In short, if one could count on a fortnight of 
uninterrupted fine weather, the hatching would also go 
on regularly ; but in our country, at the desired season, 
