( 110 } 



thofe velTels to be placeJ, not in a right line, or parallel with the 

 honey part, but twilled, with various turnings, in like manner as 

 if one were to fee the intellines of an animal in the pofture they lie 

 while joined to their membranes. 



After this, I accidently met with a large grey moth or butter- 

 fly, which in a manner flew into my hand. This butterfly I killed, 

 and cut oflf' the wings, and, having taken off the feathers, I 

 placed them before the microfcope : and here I faw the blood- 

 veflels more plainly than in the wings of the other infe6ts I have 

 mentioned. A part of one of thefe wings I placed before the 

 mici'ofcope, and caufed a drawing to be made, not only of thofe 

 blood-velT'els lying in the boney part of the wing, but alfo of thofe 

 which were difperfed over tlie membrane, and of which the mem- 

 brane, in part, confifts ; in order to Ihew, how the vefTels lye 

 twifted in various turnings ; alfo, how they are compofed of annu- 

 lar parts or rings placed together ; and likewife, how, from thefe 

 large veflels fmaller branches arife, which, in great numbers, are 

 fpread all over the membrane. 



In Plate IV. fg.ii, POR reprefents a blood-veffel, with its 

 various branches, I'pread over the membrane. ABCDEFG, is 

 a large blood-vcffel in one of the boney parts of the wing, wherein 

 is feen, the manner how this veiTel is twifted or bent, and alfo, the 

 annular parts of which it is conipofed ; in conformity with the 

 formation of tlie blood-vellels in all infc61s ; infomuch that I have 

 ieen the blood-veflels in the loufe and flea, to be compofed of fuch 

 annular parts. 



In the fame figure, B H, I K, C L, DM, EN, and E O, repre- 

 fcnt tlie blood-vellels with their branches ifl'uiiig from this laft- 

 mentioned veffel, and fpreading over tlie membrane ; and in tiiefe 

 alfo, the annular parts could be diflinguiflied ; but when they 

 became fo fmall, as to appear no larger through the microfcope, 

 than a horfe-liair to the naked eye, then the rings in tiiem could 

 no longer be difcerned. Thefe veilels the limner purfued in his 



