SILKWORM GRAIN. 
337 
to keep the rain or snow from spoiling the wire gauze. 
A gangway, four feet six inches wide, is left all round 
the three rows of trays (claies), one above the other, 
which space is not more than sufficient for feeding and 
cleaning the silkworms. It will be necessary, at fre- 
quent intervals, to cover the external basement with a 
coat of gas tar, mixed with grease, to keep ants from 
making their way in. The magnanerie must be built 
in a locality where nothing hinders the free circulation 
of air. 
The trays on which the worms rest are double, that 
is to say, in the middle, in the direction of their 
length, they are divided by the cocooning frames 
(echelettes conconniers). The worms are therefore to 
be tended right and left of the trays. 
Three rows of trays placed one above the other, in 
sufficient number, 18 inches (45 centimetres) distant 
from each other, the lowest row being also the same 
distance from the ground, make up just the height 
which a middle-sized person can reach to feed and clean 
the topmost tray ; it must be understood that a 
cocooning frame is to be placed above this latter. 
A double flooring, by which means a great number 
of trays may be arranged, must not be thought of, as 
it would intercept the free circulation of the air. The 
division lengthwise of the trays being made by the 
cocooning frames (echelettes), their length is to be sub- 
divided by other echelettes, so as to give compartments 
of 24 square inches (60 centimetres), with 18 inches 
in height from one tray to another, enclosed on three 
sides, and surmounted by cocooning echelettes. These 
dimensions I have found to be most practically 
useful. The silkworm, at the time of the mounting 
