300 PHILOSOPHICAL TRANSACTIONS. [aNNO 1668. 



The use of this instrument is very easy, since it is sufficient to guide with 

 your hands the turn-tool fastened to the pole on the plane, where the sand is 

 spread ; making such turns as usual in this kind of work ; and continuing so 

 till the glass has taken its spherical figure. It may be polished on the same 

 plane, applying to it the paper smoothly cemented on. But it is to be ob- 

 served that the polishing by this instrument is very long and tedious ; so that I 

 would advise, after the glass is wrought to the perfect figure on the plane, to 

 make use of certain gutters* proportionable to the sphere, whose semidiame- 

 ter is represented by the length of the pole abovementioned ; using the rules 

 known and observed in the grinding of convex-glasses. 



Though this contrivance be ingenious, yet skilful artists are of opinion that 

 it will be very difficult to put it into practice with glasses of any considerable 

 length. 



Extract from the Giornale de Letterati, concerning two Experiments 

 of Transfusion of Blood. N" 42, p. 840. 



The following experiment was made at the house of Signior Cassini in 

 Bologna, May 8, 1667, viz. The carotid artery of a lamb was opened, and 

 the blood was let run as long as it would into the right branch of the jugular 

 vein of another lamb, from which there had before been drawn as much blood 

 as it was judged could be supplied from a lamb of the like size, whose blood 

 should be let out till it died. After this, two ligatures were made pretty near 

 one another in the vein of the lamb that had received the blood ; and this vein 

 was quite cut through between the two ligatures. This done, the lamb was 

 untied, and without any appearance of feebleness went about, following those 

 that had made the operation. It lived a long while after, and its wound being 

 healed up, it grew like other lambs. But the 5th of January 1668, it died, 

 and its stomach was found full of corrupt food. Its neck being dissected to see 

 what had happened to the vein cut through, it was found that it had joined 

 itself to the next muscle by some fibres, and that the upper part of that vein 

 had a communication with the lower, by the means of a little branch, which 

 might in some manner supply the defect of the whole trunk. 



There was made another experiment the 20th of May last at Udina, at the 

 house of Signior GrifFoni, by transfusing the blood of a lamb into the veins of 

 a spaniel, of a middle size of that kind, 1 3 years old, which had been deaf for 



* These gutters are thus described : A polisher must be made in the form of a gutter, excavated 

 its whole length j which may also be hollowed spherical by means of a wooden mouldy turned of a 

 spheiical figure by a gage^ fixed on a mandril, and made to turn round. 



