SILK-WORMS. 
191 
perate regions, particularly near mountains ; there- 
fore, in those climates it is only necessary to leave 
the current of air free on the side where it blows 
coolest. 
Although it may seem needless, to those who 
inhabit warm climates, that I should enter into 
such minute details as those I have offered ; — as in 
an elementary work, rules should be laid down 
applicable to all cases and to all places, in the art 
of which it treats ; — I have endeavoured to speak 
of every circumstance that might occur, and to 
provide for it. All the care I have hitherto re- 
commended has tended, 
1st. To preserve the silk contained in the re- 
servoirs of the silk-worms in a constantly fluid 
state. 
2d. To keep the skin or surface of the silk- 
worm sufficiently dry, and constantly in the 
degree of contraction necessary, and without 
which the silk-worm would perish. 
3d. To prevent the air from ever being corrupt, 
and which might make the silk-worm ill, or suffo- 
cate it, at those very periods when it most needs 
its highest vigour to pour out all the silk it 
contains. 
If these rules are not observed with exactitude, 
there is danger of the accidents occurring which 
it may be useful here to state. 
1st. Too cold or agitated an air, introduced into 
