VOL. I.] PHILOSOPHICAL TRANSACTIONS. 45 



good porcelain as is made in China itself, and transparent : adding that he had 

 seen him make some. 



Account of an odd Spring in Westphalia; also of Salt Springs, and 



the straining of Salt Water. N° 7, p- 127. 

 ' In the diocese of Paderborn, in Westphalia, there is a spring which disappears 

 twice in 24 hours, returning always after six hours with a great noise, and so 

 forcibly as to drive three mills not far from its source. The inhabitants call it 

 the bolderborn, that is, the boisterous spring. 



It is remarked that no salt water which contains any metal in it, can well 

 be boiled to salt in a vessel of the same metal which itself contains, except 

 vitriol in copper vessels. 



It is added, that to separate salt from salt water without fire, if you take a 

 vessel of wax, hollow within, and every where tight, and plunge it into the sea, 

 or into other salt water, there will be such a separation made, that the vessel 

 will be full of sweet water, the salt remaining behind : but though this water 

 have no saltish taste, yet there will be found a salt in the essay, which is the 

 spirit of salt, subtle enough with the water to penetrate the wax. 



An Account of the Method of conveying Liquors immediately into the 

 Mass of the Blood. By Mr. Oldenburg. iV" 7, p- 128. 

 In this account it is asserted, that the discovery of a method of conveying 

 liquors immediately into the mass of blood is due to Dr. Christopher Wren, at 

 that time Savillian professor in the university of Oxford. The method which he 

 followed was to make a ligature on the veins, and having made an opening in 

 them on the side of the ligature towards the heart, to introduce into them 

 slender syringes or quills fastened to bladders (in the manner of clyster pipes) 

 containing the matter to be injected ; performing the operation upon pretty big 

 and lean dogs, that the vessels might be large enough and easily accessible. 

 These experiments were made at different times upon several dogs. Opium and 

 the infusion of crocus metallorum were injected into the veins of the hind legs 

 of these animals. The opium soon stupified, but did not kill the dog ; but a 

 large dose of the crocus metallorum induced vomiting and death in another 

 dog. These experiments are more circumstantially related by Mr. Boyle, in his 

 excellent book on the Usefulness of Experimental Philosophy j Part II. Essay II. 

 pp. 53-55. See also an account of other experiments of this sort in No. 27 

 of these Transactions. 



Trialsy made in Italy, of Campani's new Optic-Glasses. N° 8, p. ISl, 

 Intelligence was lately received from Rom^, importing that Campani has had 



