O F S I L K. 169 



keep down the lulphurous vapour of them. 

 If the fume of the coals Ihould become 

 very fenfible, it were befl to admit the frefli 

 air for a httle while. 



This inconvenience of cold and moifture 

 will happen chiefly in cold and changeable 

 climates ; but in hot climates you will of- 

 tener have occafion to guard againft fultry 

 and fuffocating heats, which can eafily be 

 done by admitting the frefh air. An eafy 

 method of introducing either frefli air, or 

 aromatick vapours into the room where 

 you keep the filkworms, may be feen in 

 the chapter on the difeafes of lilkworms. 



CHAP. III. 



T'he manner of the Silkwcnns Jflnnlng its 



filk-pod or ball', its continuance in it, and 



the changes it Juffers while it remains there, 



till it comes forth in form of a moth or 



butterfly. 



THERE is fcarce any thing, among 

 the various wonders which the ani- 

 mal creation affords, more admirable than 

 the variety of changes which the filkworm 

 8 undeigoes j 



