(«4P) 
Us Spherical Figure. It may be polliflit upon the fame Plain 
applying to it the Paper fmoothly cemented on. But here it 
is to be confider'd, that the polifhing, pra&ifed with this In- 
fhument, is very "long and tedious % fo that I would advife, after 
the Glafs is wrought to the perfedt figure on the Plain > to make 
~, , ' \ - , . r ufe of certain Gutters * proportiona- 
♦ ThefcGz^mthe Author def- , ~ , , £ I • , 
cribes in another pan ot this Book 5 ble to the Sphere, whole Semi-dia- 
whcre he faith, That there muft be a meter is reprefented by the length of 
PoHJher made m the form of z Guu t p . ^ w menr i nne r! . nfincr 
m , excavated its whole length- j * ne / ole aoove-mentionea y uung 
which may aifo behoiiowM spheri- for the reft, the rules known and ob- 
calbv means of a wooden Mould, f erve( j j fl fa grinding of ConVCX- 
turn d ef a Spherical fagure. by a f>\ rr 
Gage, fixt on a Mandril, and made vjlaliCS, 
to turn round : * hich he faith, n ay s 0 far this Author of this contrivance, 
alto be better perform'd upon certain l L - L ~i \1 t ~ • 
%«are Stones, of a peculiar kind, which though It be IngeniOUS and 
which, when he firrf attempted the Mathematical , yet is it conceived 
u£ot: n§ ° f Glafr " J he m3desreat by skilful and confidering Artifts, 
that it will be very difficult top'uit 
into pra&ife with GlafTes of any confiderable length - 7 it being 
alfo much doubted, whether the Author himfelf hath ever ufed 
it, or feen.it ufed in long GlaflTes. 
An Extrad 
Out of the Italian Giornalede Letterati, about two confiderable 
Experiments of the Transfufion of the Blood. 
A mo i66j. May 8. Here was made in Bononia at the houfe 
of Signior C^/#/ this Experiments/^. T here was o- 
pen'd the carotid Artery of a Lamb, when the bleud was let run 
as long as it could, into the right branch of the Jugular Vein of 
another Lamb, from which there had before been drawn fo much 
feloud, aswas judged., it could be fupplyed with from a Lambof 
the like bignefs,whofe blond fhould be let out till it dyed. After 
this, there were made two ligatures pretty near to one another, 
in the vein of the Lamb, that had received the bloud 5 and this 
vein was quite cut thorow betweeathe two ligatures, to fee 
what would happen thereupon. This done., the Lamb was un- 
tyed^ which without any appearance of feeblenefs, went about, 
following thofe that had made the operation. It lived a long 
while 
