SUPPLEMENT. 159 



seen above, and kept there until the time called Thsing- 

 ming, (the 5th of April.) 



The latter eggs, that is to say : the eggs of Autumn, 

 which proceed from a second laying in the year, ought not 

 to be washed. 



PRECAUTION FOR PRESERVING THE EGGS. 



A small frame must be made with four pieces of bamboo, 

 and leaves placed upon them. Suspend it upon an elevated 

 joist, where it will be exposed to the air, and sheltered from 

 the sun. It will be dangerous to permit the smoke of the 

 oil of thong, (bignonia tomentosa,) or fumes from charcoal 

 to circulate about the leaves containing the eggs. In the 

 winter months, do not expose the eggs to the reflection from 

 the sun, which has the effect of rendering them empty and 

 steril. When a great deal of snow has fallen, the leaves 

 must be hastily taken in. The next day, when the snow 

 has passed, they may be suspended as before. The last 

 month of the year must be waited for to wash them, and 

 deposite them in the box. 



DIFFERENT KINDS OF SILK WORMS. 



There are some early silk worms, (silk worms proceeding 

 from eggs laid in the Spring of the year,) and the late silk 

 worms, (worms proceeding from the eggs of Autumn.) 

 Every year the latter hatch five or six days before the 

 others, (that is to say : they take five or six days less to 

 hatch ; they also form their cocoons much sooner, (that is 

 to. say: they arrive at maturity much quicker;) but these 



