94 ON REARING. 



nursery. If it be sultry, it will not be sufficient to raise up 

 all the window blinds to dissipate the heat. The paper 

 must then be removed from the windows, the small dormer 

 windows of the roof must be opened, and the air conduc- 

 tors also, which are even with the ground, and fresh water 

 must be sprinkled outside of the windows, and about the 

 bottom of the sash. A cool air will soon circulate in every 

 part of the nursery. 



When that sultry heat is dissipated, the paper must be 

 again pasted on the windows, and the air pipes stopped up. 

 In this manner the silk worms are neither incommoded 

 with the heat nor cold, from the commencement to the 

 end of the season. They have very little sickness among 

 them, and the cocoons are as good as may be desired. 

 It is by observing these proceedings that all the success 

 of the raising of silk worms depends. But the cool air 

 must not be suddenly replaced by warm ; the fire must be 

 increased gradually. If the cold rapidly succeeds to heat, 

 the silk worms will become yellow and soft. When it 

 is too warm, a cool air must not be introduced suddenly 

 in the nursery ; the windows should be opened by degrees. 

 That precaution is necessary, for if the heat be suddenly 

 replaced by a cool air, the silk worms will turn white and 

 die. It is a serious danger, which should be known before- 

 hand, in order to remove the causes which give rise to it. 





