348 ON THE PRODUCTION OF 
and fitting to the size, are made to .slide in. The 
inside boxes are at intervening spaces of three centi- 
metres, and contain a layer of grain only one centi- 
metre thick. They are then to be closely shut up, 
having been filled to the top with grain, to avoid all 
shaking. 
This box is then to be placed in a strong wooden 
case, pierced with several holes, covered with wire 
gauze, or perforated zinc. Between the sides of the 
outer case and those of the enclosed box, there must 
be a space of two inches, to be filled entirely with 
small pieces of charcoal. The charcoal will allow the 
air to circulate amongst the grain, and, what is equally 
important, will prevent any damp from getting to it. 
As soon as the grain reaches its destination, whether 
after a long or short journey, it must be immediately 
exposed to and kept in the air in boxes similar to those 
described in the first instance. 
In drawing up this paper, I have been as concise as 
the subject would permit, avoiding all essentially tech- 
nical terms, so that any one may understand my state- 
in antts ; and I sum up my system in these words : — 
" Do not attempt to cure the disease 'in the minute 
silkworm ; it would be lost labour. Prevent it by a 
reasonable system of education, and you will succeed. 
Prevention is better than cure." 
A few words on the difference between education for 
grain and education for silk. As the course of educa- 
tion in the open-air for grain must necessarily be long,, 
so that for silk must be speedy. Education for grain 
should have but one object in view — the strength and 
health of its productions. That which is for silk, on 
the contrary, aims at obtaining, with the least possible 
