1 7M ] 
XIII. Some Remarks concerning the Circula- 
tion of the Blood, as feen in the Tail of a 
Water-Eft, through a Solar Microfcope, ly 
the Rev J Mr. Henry Miles 3 communicated 
in a Letter to Mr. John Eames, F. R. S. 
SIR , 
I Well remember the great Satisfa&ion you cx- 
preffed in the Microfcope made by Dr. Lieber- 
kuhn. This induced me to communicate to you an 
Experiment I have made once and again, with one 
of theiame kind, made by Mr. Cuff in Fleetfireet. 
I had been eagerly wifhing for an Opportunity to 
attempt to fee the Circulation of the Blood in this 
Way 5 and for that Purpofe got fome Gudgeons , 
which I kept Two Months in Water, this Winter, 
waiting a favourable Day ; but I did not fucceed well, 
though I faw it plain enough to convince me, that it 
was worth while to attempt it in a better Subject ; for I 
End the Fins of Fifli to be of a cartilaginous Nature, 
have few Veffels, andthofe fmall. But the Lacertus 
Aquations of Mr. Ray , commonly called the Water - 
Eft , having a Tail that feemsto be much fofter, and of a 
flefhy Subftauce, and abounding with large Blood- 
.veifels, is excellent for thisPurpofe. Having procured 
me one of the lighted Colour, and mod tranfparent, 
I put it into a glafs Tube, of a Bore jud big enough 
to receive it; the fmailer the Tube, the better, pro- 
vided you can get it in without injuring it. When I 
had fixed the Tube in the Body of the Microfcope, I 
5 B fouad 
