SILKWORM GRAIN. 
335 
Before all things, it was indispensable not to depart 
from the laws of nature, lest, through principles, 
tending to a rapid degeneration, I should lose the 
reward of all my labours. After a long series of 
minute and costly experiments, I have succeeded, as far 
as, possible, in making education on the tree, with 
the help of the open-air magnanerie as its natural 
sequence, a matter of course ; and in thus rearing a 
great quantity of silkworms by not depriving them of 
their essential element — pure air — the air being con- 
tinually renewed ; in a word, rearing them in the 
external circumambient air. 
The splendid results obtained in the South from 
grain produced in my magnanerie have proved, to my 
own satisfaction, the excellence of my own system. 
And what is more clearly evidence of this lies in the 
fact that every year intelligent educators rear my grain 
without artificial heat, and obtain from it a supply of 
grain of the first quality. But nothing can last for 
ever, and it would be requiring too much of this open- 
air education to expect that it will, once for all, 
regenerate the race of silk worms from the moment 
that the system of education is changed, and this 
belief would only lead to great disappointment. It is 
absolutely necessary to have a firm conviction of the 
following principle : — The grain which has been 
regenerated on the mulberry tree and subsequently 
reared in the open-air magnanerie, and afterwards in 
the magnanerie not heated, cannot be reared for grain 
the following year. It will yield an excellent crop of 
silk ; but the imprudent director of a magnanerie, 
whose education for the produce of silk has been con- 
ducted with the aid of artificial heat, and who would 
