[ 3 10 1 
Thefe experiments not only prove that the par- 
ticles of the blood are fiat, and not globular ; but 
likewife, by proving that they are flat, they fhew 
that they are not fluid, as they are commonly be- 
lieved to be ; but, on the contrary, are folid ; be- 
eaufe every fluid fwimming in another, which is 
in larger quantity, if it be not foluble in that other 
fluid, becomes globular ; this is the cafe where a 
fmall quantity of oil is mixed with a larger quan- 
tity ot water, or if a fmall quantity of water be 
mixed with a large one of oil, then the water ap- 
pears globular. And as thefe particles are not glo- 
bular, but flat, they muft be folid ; a circumftance 
that will appear ftill more evident from future ex- 
periments. 
It is neceflary to remark, that in a few minutes 
after the particles are fpread out on a glafs, they run 
in cl ufters, and ftick to each other, and then they 
appear confufed. 
When one of thefe particles is attentively ex- 
amined, while feparate from the reft, it appears, 
as it lies on its flat fide, to have a dark fpot in the 
middle, and round that dark fpot it is more tranf- 
parent. This dark fpot was believed to be a per- 
foration, or the particle was fuppofed to be a hol- 
low ring, by the ingenious Father de la Terre.. 
But I find, from a great number of experiments, 
that the dark fpot is a folid particle contained in a 
flat veficle, whofe middle only it fills, and whofe 
edges are hollow, and either empty, or filled with 
a iubtile fluid. This will be evident to every one 
who will carefully make the following experiments. 
ExP-RRI“ 
