and Circulation of the Blood . ijj 
Before I clofe tills Chapter, I ihall briefly 
communicate iome Experiments I had the 
Pleafure of making latt Summer, with iriy 
moft ingenious and valuable Friend Dodor 
Alexander Stuart, Phyflcian to her late 
Majefly, in order to view the Circulation of 
the Blood by the Solar or Camera Obfcurd 
Micro/cope , which has the Advantage of 
magnifying Objects beyond any other Sort 
of Microfcope ; but mufl refer the Curious 
to a more full Account thereof laid by this 
Gentleman before the Royal Society, arid 
which will be published in the Philofophical 
Br anfact ions. 
I mufl: Arid defcribe a particular Apparatus, 
invented by the Doctor for examining the 
Circulation of the Blood in Frogs, Mice, 
Bats , or any Creatures of the like Size, fri 
this Contrivance the Looking-glafs, Tube, 
and convex Lens are juft the fame, and 
placed in the Hole of a Wiridotv-fhutter in 
the fame Manner, as defcribed Page 22, But 
here, inflead of uring Wilson’s littl t Pocket 
Mtcro/cope , he has got the Belly-part of a 
large Reflecting one Axed horizontally on a 
Pedeftal, at a Pleight exadly equal to the 
Tube. This Hands on a little Shelf made 
to fupport its and to the Snout thereof, 
which lies on a Level with the Tube, the 
Magnifiers are fcreived. The Qbjed, being, 
extended and fattened with Strings and Pins 
pn a Frame convenient for the Purpofe, is 
applied 
