SILK-WORMS. 
303 
newed except by the breaches which time had 
worn in the doors and windows ; and that which 
made this seem more sad and deplorable, was 
remarking, that the persons who attended to 
these insects, however healthy they might have 
been when they entered on the employment, lost 
their health, their voices became hollow, their 
hue pallid, and they had the appearance of valetu- 
dinarians, as if issuing from the very tombs, or 
recovering from some dreadful illness. 
All buildings are good for rearing silk-worms, 
provided that, in proportion to their size, there 
be one or more fire-places, two or more venti- 
lators in the ceiling, and on a level with the floor, 
and one or several windows, or apertures, by 
which light may constantly come in, and yet not 
sunshine. 
My tenants’ laboratories, which contain the 
worms proceeding from four ounces of eggs, have 
two fire-places placed in the angles, a stove, four 
ventilators in the ceiling, and three in the wall, on 
a level with the floor. I have laboratories that 
only hold the worms proceeding from three ounces 
of eggs, having two small fire-places, three venti- 
lators in the ceiling, and two in the basement. I 
have, besides, laboratories that are calculated for 
two ounces of eggs, with two small fire-places, 
two ventilators above, and two in the lower part. 
