1 313 ] 
firmed by obferving that although the particle docs 
In an oblcure glafs appear only to have a dark fpot 
which mi jit be fuppofed to be a hole, yet, with a 
very transparent lens, and a good light, after di- 
luting the blood with ierurn, that middle part can 
be diltinftly feen to be cnlj r of a deeper red than the- 
re ft of the veficle, and thence appears darker. 
In thefe experiments* made by adding water to 
the blood, the middle particles appear to be lefs ea- 
lily foluble in water than the flat- veficle which 
contains them ; lo that, a little time after the proper 
quantity of water has been added, the flat veficle? 
diiappear, leaving their middle particles ; which' 
feem to be globular, and very fmalL 
That theie fed vehicles of the blood, although 
flat, are not perforated, is evident likewife from a 
curious appearance which I have repeatedly ob~ 
ferved in blood that has been kept three days in the- 
fummer feafon, fo that it was beginning to putrefy 5. 
the veficles of this blood being diluted withferuro,,, 
and examined with a lens To- of an inch focus, but 
more particularly when examined with M. de la- 
Torre’s glafs, which, by his computation, magnifies 
the diameter 1280 times, were found to have be- 
come fpherical ; the diameter of thefe fpheres was 
lefs than their largeft diameter when- flat, and their 
external furface was corrugated in Inch a manner- 
o 
as to make them appear like final! mulberries. 
I have feen the lame appearance on mixing le- 
rum that had been kept three days in a warm place, 
and fmelt putrid, with frefh-drawn human blood y 
the veficle affumed this globular and. mulberry-like, 
appearance^ 
Im 
