Microscopical Essays. jgy 



often made ufe of water, injected by a fyringe, to cleanfe 

 thoroughly the internal parts, then blew them up with air and 

 dried them, by which means he rendered them durable, and fit 

 for examination at a proper opportunity. Sometimes he has ex- 

 amined with the greateft fuccefs, and made the moll important 

 difcoveries, in infects that he had preferved in balfam, and kept 

 for years together in that condition. Again, he has frequently 

 made punctures in other infects with a very fine needle, and after 

 fqueezing out all their moifture through the holes made in this 

 manner, he rilled them with air, by means of very (lender 

 glafs tubes, then dried them in the (hade, and laft of all anointed 

 them with oil of fpike, in which a little rofm had been diffolved, 

 by which means they retain their proper forms a long time. He 

 had a lingular fecret, whereby he could fo preferve the nerves of 

 infects, that they ufed to continue as limber and perlpicuous as 

 ever they had been. 



He ufed to make a fmall puncture or incifion in the tail of 

 worms, and after having gently and with great patience fqueezed 

 out all their humours, and great part of their vifcera, he then in- 

 jected them with wax, fo as to give and continue to them all the 

 appearance of healthy vigorous living creatures. He difcovered 

 that the fat of all infects was perfectly diflblvible in oil of tur- 

 pentine ; thus he was enabled to mew the vifcera plainly ; only 

 after this diflbJution he ufed to cleanfe and wafh them well and 

 often in clean water. He frequently fpent whole days in thus 

 cleanfing a fmgle caterpillar of it's fat, in order to difcover the 

 true conftruction of this infect's heart. - His lingular fagacity in 

 flopping off the Ikin of caterpillars, that were upon the point of 

 fpinning their cones, defer ves particular notice. This he effected, 



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