, (^17) 
they abfolv'd their Relation. But it was not fo here with the 
Apparences in Venus. For one fees them but for fo fmall a time^ 
that it is far more difficult ^ certainly to knoW;> wiien they return 
to the fame place. 
Yet this I can fay, Cfuppofing that this bright part of Venu^^ 
which I have obferv'd, efpecially this yearid^y, hathalwayes 
been the fame) that in lefs than one day it abfolves its motion;, 
whether of Revoktion or Lihration^ fo as in near 23 hours it re- 
turns about the fame hour to the fame fcituation in this Planet 5 
which yet happens not without forae irregularity. Now to af- 
firm, ffuppofingit to be alwayes the/^»^^ bright part) whether 
this Motion is made by an entire Revolution^ or by a Lihration-^ 
I dare not yet doe, in regard I could not fee the Continuity of 
the Motion through ^ great part of the Arch^as I did in the other 
Planets. And for this very xtziox^^that will alwayes be difficult to 
determine. 
An ExtraB, 
of a Letter^ mitten J. DENIS, ID oB or of Fhjfick^ and 
Fnpfe([or ofPhilofofhy and the Mathematicks at Paris, touching 
a late Cure of an Inveterate Phrenfy hy the Transfufion of 
Bloud, 
This Letter ivas Utelj fent hj the Auth r himfelf to the Pub/iflier, as it 
was f rimed at Paris in French • the fuhfiance whireof is Hnglifh, as 
followes. 
IT is now almoft a twelve-month that I declared my felf pub- 
lickly in this matter of Transfufion^ and after I had grounded 
my Conjedlures upon divers reafons, and a number of Experi- 
ments which I made joyntly with\A/. Bmmerez^ I refolv'd to 
expeiS in the fequel a further confirmation, by carefully obfer- 
ving all that fliould happen in the feverall Trialls, I intended to 
pradife. 
In this refolution wehave fince let flip no oceafion, to im« 
prove this Operation, which hath been- followed with good fuc- 
cefs, and I could here alledge fome particular Relations , the 
cifcumftances of which would appear curious enough, if I did 
not 
