Microscopical Essays. 



in the management of fmall glafs tubes, which were no thicker 

 than a brittle, and drawn to a very fine point at one end, but 

 thicker at the other. Thefe he made ufe of to fhew and blow up 

 the fmalleft. veflels difcovered by the microfcope, to trace, diftin- 

 guifh, feparate their courfes and communications, or to inje£t 

 them with very fubtil coloured liquors. 



He ufed to fuffocate the infe&s in fpirit of wine, in water, or 

 fpirit of turpentine, and likewife preferved them for fome time in 

 thefe liquids ; by which means he kept the parts from putrefying, 

 and confequently collapfing and mixing together ; and added to 

 them befides fuch ftrength and firmnefs, as rendered the diflec- 

 tions more eafy and agreeable. When he had divided tranf- 

 verfly *dth his fine fciflars the little creature he intended to 

 examine, and had carefully noted every thing that appeared 

 without further difleclion, he then proceeded to extract the 

 vifcera in a very cautious and leifurely manner, with other in- 

 ftruments of great finenefs ; firft taking care to warn away and 

 feparate, with very fine pencils, the fat with which infects are 

 very plentifully fupplied, and which always prejudice the internal 

 parts before it can be extracted. This operation is bell per- 

 formed upon infects while in the nympha ftate. 



Sometimes he put into water the delicate vifcera of the infects 

 he had fuffocated ; and then making them gently, he procured 

 himfelf an opportunity of examining them, efpecially the air 

 veflels, which by this means he could feparate from all the other 

 parts whole and entire, to the great admiration of all thofe who 

 beheld them ; as thefe veflels are not to be diftin&ly feen in any 

 other manner, or indeed feen at all without damaging them, he 



often 



