(122) 
nie toprofecutefuchObfervations, concerning which I fliall 
at prefent impart to you what follows : 
I. The fmall Red Globuls in the Blood, formerly fpoken 
of are heavier than the Cryftalline liquor irr 
See^M/^^. 102. ^j^j^j^ ^j^^y are carried, becaufe foon after that 
the Blood is let out of the Veins, thofe Globuls 
by little and little fubfide towards the bottonnand being made: 
up of foft fluid Corpufcles, and many lying upon one another, 
they do unite themfelves clofe together, and by this clofe con- 
junction the Blood that is under the furface alters its colour , 
and becomes dark-red or b^ackifli ; as I have obferved feveral 
times; of which I takethereafonto be, (with fubmilTion to 
better Judgmentsj that the Air cannot move every way round 
about the Globuls, and hits as 'twere againft a clofe darkifli 
body. Touching the Florid red colour of the furface of the 
Blood expofed to the Air, that comes, in my opinion , from 
hence, that the /^/^/^^-^-^/^ Globuls are not prefs'd, and there- 
fore retain their nature,and the Globuls [ubjacent to the upper- 
moft lye clofe together, by reafon of which ciofe conjunftion 
the Air or Light cannot penetrate through them, but is refle 
fled, and fo gives a greater light to,and about, the uppermoft 
Globuls, than they had before the union of the inferiour Glo- 
buls ; and this it is that makes them appear more florid. 
2. I ftall herewith communicate the Manner hovp I have ob 
ferv'd, am.ong other things, Blood dXid ^J^ilk. I did my fell 
^ Cf^Fi I - P^'epare divers forts of very flender hollow Glafs- 
* pipes, as A B, of which feme w^ere not thicker 
thanamans-hair ; and the Qenderer they are, the clearer will 
they make the red Globuls of the Blood appear. But, for feeing 
the Cryftalline water in which thofe Globuls move, and for 
obferving aifo howuhey fubfide, thefe Pipes may be made 
fomewhat thicker. Having then made ready fuch a fmall 
Pipe, Ityeabouttheuppeimofc joyntof (e. g. ) my thumb 
a firing, as is ufual in opening a Vein of an A rm, and then ] 
prick that part of my thumb with a pin, to make it bleed ^ 
this blood I wipeoff, if I intend to keep any for the Air. And 
then I look w^ll to the place prick's putting upon that poii^ 
my Glaf^-pipe, and withal fqueefing my thumb to prefs oi4l 
mon 
