266 
THE ART OF REARING 
about the feet, and in the under part of the body, 
than in the upper part ; the former being more re- 
The dampness, pressing- on the skin of the silk-worm, in- 
tercepts transpiration, and consequently impedes the issue of 
that superabundance of moisture introduced by food into the 
insects ; as, in this instance, the action of the carbonic acid 
is diminished by the .admixture with the moisture, the disease 
called segno does not occur, but the jaundice or il giallume 
will appear. 
In works on arts there are repetitions of rules which should 
3iot be criticised, and I think the following will not be ob- 
jectionable : — 
To avoid the diseases called rouge and jaunes, says M. 
Dandolo: 
“1st. Constantly keep a perpendicular current of air about 
the wickers ; and should the air in any part of the laboratory 
appear to want circulation, open the corresponding ventila- 
tors. Often make wood fires ; and if these heat the labo- 
ratory too much, in this case water the floor of the laboratory-, 
which will produce coolness and more circulation of air, be- 
cause the water will be transformed into vapour by imbibing 
the heat. 
“ 2nd. Cool the laboratory as much as possible. 
‘‘3rd. If there beany suspicion of disease among the silk- 
worms, speedily change the litter of the worms, and repeat 
this change more frequently than is prescribed in the ordinary 
course of management. 
“4th. Feed the silk-worms on the driest leaves that can 
be got. 
“ 5tli. Prolong the existence of the worms for some days. 
Avoid giving them frequent or superabundant meals ; because 
if the food accumulates in the stomachs of the worms in too 
large a quantity, it may excite too great interior heat, which 
would facilitate the chemical alteration of the body inclined 
to disease. 
“ 6th. In short, in untoward circumstances, it is preferable 
the worms should be exposed to much air, to cold, to frequent 
