t 449 > 
end that it may not fee, and then ’twill lye the ftiller up- 
on the Copper-Plate 5 and the Tail is laid upon the Glafs 5 
and that part of the Body of the Eel, that is wound about’ 
with the Cloth, is alfo faften*d to the Plate with a Wire, 
that the Eel may not riggle it felf off. 
The Eel being thus placed upon one fide of the Glafs 
in the Copper Plate, The Microfcope, through which 
you are to view the Circulation, is fatten’d by Wires and 
.Screws on the other fide, in fuch manner as it may be 
moved upwards and downwards, and every way. And this 
I take to be a better Method concerning the Circulation 
■of the Blood than my former 5 which if People wou’d 
therefore ufe, I doubt not but they might obttrve the 
fame Things in an Eel as I have done : And then if you 
wou’d .view the Arm, and with great Care confider the 
Pulfe in the Veins, you wou’d certainly difcover^that the 
Blood, which makes the Pulfe, proceeds from the Hand. I 
,conclude, and am. 
Antony van Leeuwenhoek. 
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