VOL. XLVII.] PHILOSOPHICAL TRANSACTIONS. IQQ 



tention to whatever could be imagined necessary ; and as they had done so no 

 where on the continent, Italy alone excepted, Dr. Mortimer was desired by the 

 Royal Society to acquaint Mr Winkler of this want of success, and at the same 

 time to desire him to transmit hither, not only a circumstantial account of the 

 manner of making his experiments, but likewise, lest the difference of the result 

 might arise from employing different kinds of glass, some globes and tubes fitted 

 up under his own eye in the most advantageous manner. This Mr. Winkler 

 was so obliging as to comply with ; and accordingly the Society has received 

 from him 2 globes and 4 tubes ; and at the same time this gentleman sent a 

 letter to Dr. Mortimer, dated at Leipsic, Nov. 23, 1750, minutely describing 

 his manner of using them. 



The tubes and globes referred to above, were received by the r. s. about the 

 middle of May 1751, and were presented to that body by the president at their 

 next meeting; and they were put into Mr. W.'s hands, that their effects on trial 

 might be reported at a future meeting. The largest sphere was of crystal glass 

 of about 7 inches diameter, fixed to its wooden spindles by a resinous cement, 

 and contained not more than half an ounce of a terebinthinate fluid, less deep 

 in colour than balsam of Peru, and more so than balm of Gilead. The smaller 

 globe was 5 inches in diameter, mounted nearly as the larger one, and contained 

 about half an ounce of beaten cinnamon. The tube containing the flowers of 

 sulphur was 2 feet in length, and about half an inch in diameter : it, like the 

 globes and the other tubes, was of crystal glass, and in like manner with the 

 rest of the tubes was hermetically sealed. The tube, said to contain balsam of 

 Peru and chalk, was about 20 inches long, and -f- of an inch in diameter : that 

 said to contain opobalsamum was about l6 inches long, and half an inch in dia- 

 meter: and that with spirit of wine and chalk was about 17 inches long, and 

 about half an inch in diameter. The manner of mounting these globes might 

 be somewhat exceptionable for the purposes intended, as the necks were fitted 

 to their wooden blocks with a resinous cement without glass stoppers ; so that 

 when the globes, from their being rubbed, had warmed the cement, if an odour 

 of the matter contained in the glass had been perceptible, it might have been 

 urged, that it came through the cement with more probability than through the 

 glass : but nothing of this kind could be objected to the tubes, as they were 

 hermetically sealed. 



June 12, 1751, there met at the house of Mr. W. in order to make trial of 

 the effects of these glasses, Martin Folkes, Esq. p. Nicholas Mann, Esq. v. p. 

 Dr. Mortimer and Peter Daval, Esq. Sees. Mr Canton; and Mr. Schrader, a 

 gentleman of distinction well known to, and corresponding with Mr. Winkler. 

 The presence of this gentleman was fortunate, as he was thus enabled to satisfy 

 both himself and Mr. Winkler of the zeal and address which were exerted in 



