C 107 ) 



ed with fuch a number of veins or velTels as would be requifite for 

 the formation of fuch feathers and hairs. 



In my endeavours to inveftigate this fubie6t, I firft examined one 

 of thofe flying infedts, whofe wings confill of membranes only, 

 without either hairs or feathers ; which membranes are placed 

 between the large veffels and fmews, giving ftrength and fliffnefs to 

 tlie wings ; and upon the examination of thefe, I plainly faw that 

 there were large blood-velTels running among the fmews or mufcu- 

 lar parts, from which arofe fmaller vellels, and thefe again divided 

 thcmfelves into flill fmaller ones, until at lengtli they became 

 invifible. 



I was not, however, content with this, and among other obje6ls, 

 I met with a large green grafshopper, in tlie wing of which I more 

 clearly perceived not only, that from tlie large blood-veflels in the 

 wing, other fmaller ones arofe, but I alfo faw that the colour of tlie 

 blood in thefe large veflels was green ; and in the fmaller veffels and 

 their more minute ramifications, I could ftill diflinguilli tlie blood to 

 have a greenilh caft ; but when tliefe veflels were again fubdivided 

 into fmaller ones, I could not perceive any colour in them, and the 

 velfels themfelves became ib clear and tranfparent that they entirely 

 efcaped the fight. 



Tliough I could mofl: plainly fee tliat the fubflance, or matter, 

 of which this blood was compofed, confifled of globules fwimming in 

 a clear liquor, I moreover cut the wing in two, and out of the veflels 

 collected fome of tlie blood, which I placed before the microfcope, 

 and obferved that where the globules or particles of it lay in numbers 

 or heaps together, tlie colour was a lively green, wliere they lay fo 

 thin as not to amount to the twentieth part of the thicknefs of an 

 hair of one's head, the colour was only greenifli, but where tlie 

 globules were fingly dil'perfed, it had no longer any appearance of 

 colour at all, but becanic tranfparent , and hero it clearly appeared 



