SILK-WORMS. 305 
they are young, and keeping them too confined 
and close. (Chap. XII.} 
However crowded the worms may be, if the 
common cultivator sees them move and feed he is 
satisfied they are doing well ; he does not distin- 
guish those that are squeezed against others, and 
cannot feed easily, or, indeed, at all, and they 
sooner or later perish under the litter that covers 
them. 
In each cultivator’s laboratory there should be 
one or two good thermometers left there con- 
stantly. 
It may not be superfluous to remind the 
reader, that should any worms be slow in ris- 
ing, and more backward, they should be removed 
elsewhei’e, that equality may be preserved. 
(Chap. VIII. § 5.) 
It would be advantageous to the proprietor to 
give the cultivator a thermometer and a baro- 
meter, teaching how to ascertain the degrees of 
heat and moisture of the laboratory. The culti- 
vator will then be better able to use those means 
efficaciously which will preserve the air in the 
state most favourable to the progress of the silk- 
worm. And, although the fumigating bottle be 
not indispensable, yet, as at some periods the 
animal exhalations leave an unpleasant smell, it 
may be very useful to the cultivator, the vapour 
it yields being a desirable corrective. 
