(166) 
GlafFes into the Tapers, I found the finalleft Prints fomewhat 
larger, but not fo clear, fodiftinft, nor fo pleafing to the Eye, as 
when I ufe the Empty Tapers. Alio 1 amfo confirm'd, that 
thefe empty tapers do preferve, ftrength- 
* this may give ocufion en,"'§nd in fome fmall degree recover the 
to confider , Whether -to a, fight, * And I find my felf beft at eafe 
with thofe L( *\ htrn Tubes > 1 fitft ufed 5 
may be a Remedy / Ani and rather without any faftning to the 
wbethm r that hindrance of b e f ^ spetfacles : For , as they 
Refractions, which belpes . . , n - i . * 3 ,T. / 
fome Eyes, faipes not •- hang in that flight manner, I can with a 
thers ? touch of my finger raife them up y or 
bow them down, divide them, or unite to 
take in the fame obje<5t, which is more than I faid at firft. And 
I put them off and on as fpeedily and as eafily as any other Specta- 
cles. 
An Mxtraft of a Letter* 
Written from Dantzick to the Honour Me R # Boyle, contain- 
ing the fuccefs of fome Experiments of Infufing Medicines 
into humane Veines. 
\ M Onfieur Smith, Phyfitian in Ordinary to this City, having 
I VI liberty granted him to try an Experiment upon fome per- 
fons defperately infe&edwith the Poxe, then in the publickHo- 
fpital here, adventur'd the opening aVeioe, and Infufing fome 
Medicines into the blood 5 which was tryed upon twoperfons , 
whereof the one recover'd, and the other dyed. Yet being 
fince farther encouraged by correfponding with fome of the Roy- 
al Society in England, about a Moneth fince, the faid Phyfitian , 
together with Monfieur schefeler r mothev antient PradHtioner in 
this City, repeated the Experiment by infufing Altering Medi- 
cines ino the Veines of the right Armes of three perfons: the 
one., lame of the Goute § the other, extreamly ApopleSical 5 and 
the third, reduced to extremity by that odd diftemper, the Plica* 
Poknica. The Succefs of this, as Monfieur Hevelius (who was 
the perfon only admitted to be prefent at the operation J informes 
me, was 5 That the Gouty man found himfelf pretty well next 
day, and ftortly after went to work, it being Harveft time, and 
has 
