f 1182 ) 
imls, that have Blventrous Heart Sy the Veffeis of the reft 
of the Body return their Blood to the Heart in equal time 
and qnantity with thofeot the Lungs, notwithftanding the 
inequality of theip Courfe. 
'■^^:'^!'T^ ^ Tliis Difference in die principal Organs of the Circn^ 
cnriipciT thote Creatures, (on whicli only 
dent^rd Mo^-fhcfe Experiments have been hitherto made) mov'd me to 
H^e" a!?!^" ^^H^ forr^e, cnAmmals whole Organs differ only from the 
tx^iii. sinceit Hnrmne in their grofs Figure, and not in their Intimate 
faJiy'V^d ^^^t^L'^^^^^^ • For this end I took a young Cat, about ten or 
thaf t^irure' twelve days old, and faftened it to a Board as in Vivefefti- 
^^Mi'haii^^^ 5 and making an Incifion through the Linea Alba, the 
^inLlfJAmaUpmtn^ and Inteftines were extruded ^ then caufing the 
vffhere jhe ujes Crcatufe to be fo held (on the Board) under a hrgQ Douhle 
^j^Ju^'i^'i^u ^icrojcope, where a flat Clafs for receiving of Objefts was 
fiiyoays bs be^ placcd Horizontally, on which I expanded iht Omentum or 
^^ZmcJdoir^ Caul, fa Light being placed underneath J I faw the Glo- 
cuUtes hi- Men bules of the Blood move very fwiftly in the fmall Veffeis, 
0fter the fame which are Only to be feeri in the moft Tranfparent parts of 
%7slnKQ]l, t\\Q Memhranes o\ its Omentum ^-^ but the motion of the 
Perches, Eats, Blood focn abated, and its Globules were withdrawn from 
cfelZls!^ Extremities of its Blood Veffeis 5 and in a little time 
rohieh Aio^/a/rbecarhe flagnant in their Lirger Branches. 
Leeuwenhock This appearance of the Continuation of the Extremities 
tried tr. Though ^ , ^ ■ • •» i x?- . t -i i T^t i 
thewayskow !tOi the Arteries with the Veins, while the Blood was mov- 
Zlhl'E'f^n them, in the Omentum or Caul,' is expreft by Fig. 4. 
tknJlvJliot,^-^ ftews the Trunk<J of the Arteries, BB the Veins^ 
that I kmwof^v^/\Y[Q\\ WQXQ dift inguifhable by contrary currents of the 
t^ercdf"^ Globules of the Blood in each VelTel. CCC (hews the 
Branching of the Extremities of thQ Arteries and Feins, that 
no lon'ger Affcci ate with each other, but are United, as 
here expreft. After I had feen this, I attempted to fhew 
the like to feveral Friends, but did not always fucceed fo 
well as when Mr Chamber's and Mr Buckeridge favoured me 
with their prefence, at a time w^hen I happened to have a 
young lean Dog, that was not large 5 in whofe Omentum 
we 
