OF SILK. 183 



IS greatefl:, that it may penetrate more ef- 

 feftualy through their thick and hard fub- 

 llance. There are three methods of fuffo- 

 cating the grubs in the filk- balls : firft by the 

 ardent heat of the rnid-day fun ; fecondly 

 by the heat of ovens ; thirdly by the fteam 

 preceeding from fcalding water ; in the 

 firii and the third of thefe methods there 

 is no danger of the heat injuring the filk, 

 and therefore they are to be preferred, when 

 your conveniency permits. 



In order to kill the chryfals or grub by 

 the heat of the fun, you mufl choofe a 

 clear day, without clouds or wind ; about 

 ten or eleven of the clock, fpread the filk- 

 balls to its rays, and letting them remain 

 in this manner for about four or five hours ; 

 wrap them up clofe in coarfe cloths, which 

 fhould alio have been expofed to the funs 

 heat, to the end that their liifling warmth, 

 added to what the balls have before re- 

 ceived, may the better anfwer the intend- 

 ed effec^t. If the cloths were black or of a 

 dark colour they would conceive the heat 

 better, and after the worms are wrapped 

 up in them, they fliould remain in the 

 lun's heat fo long as you perceive it can 

 preferve any confiderable warmth in them. 

 N 4 The 



