50 PHILOSOPHICAL TRANSACTIONS. [aNNO 1750. 



the filter before evaporation, but not after it. This was the reason which in- 

 duced him to examine, by various repeated trials, and to give an account of the 

 superior strength of Jessop's well water, above all others that he had examined 

 or heard of. 



When Jessop's well was cleaned, Oct. l6, 1/49, after a considerable quantity 

 of rain, after about half a foot depth of black muddy filth was taken out, then 

 the natural fat sandy-coloured clay-bottom appeared ; through several parts of 

 which the water oozed up at the rate of l6o gallons in 24 hours. 



The water which then came fr-esh from the spring gave a weak blush with 

 galls ; but when put into bottles it did not do so next day ; a sign that there is 

 some degree of steel in it. 



It was very observable, that the man who stood about 3 hours bare-legged 

 in this well-water to clean it, was purged so severely for a week, that he said he 

 would not venture, on any account, thus to clean the well again. And it was 

 the same with another man, who cleaned the same well about ] 2 years since. 

 And he was credibly informed by a merchant, that being in a warehouse in 

 Egypt to see senna baled up, it had the like purgative effect on him. 



To get a satisfactory account of the efficacy of these waters, he desired Dr. 

 Adee of Guildford, who has long prescribed them to his patients, to give his 

 opinion of them ; which he did as follows. 



I have found very advantageous and uncommon effects from the use of the 

 waters of Jessop's well. Some of my patients, who have drank them steadily and 

 cautiously, have been cured of obstinate scurvies. As I had a long time ago 

 reason to think there was a fine volatile spirit in them, I obliged some to drink 

 them for a course of time at the well as an alterative, with very happy conse- 

 quences. When I have ordered them as a purge, they have worked verj- 

 smartlv, but have not dispirited. I am glad to have it in my power to confirm 

 your sentiments by my own observations ; and am satisfied these waters, if con- 

 tinued a proper time, and taken in a proper manner, may be rendered very be- 

 neficial to mankind. 



Abstract of a Discourse intitled. Reflections on the Medals of Pescennius 

 Niger, and on some Circumstances in the History of his Life ; written in French 

 by Mr. Claude Gros de Boze, Keeper of the Medals in the French King's 

 Cabinet, &c. and sent by him to Dr. Mead, who communicated it to this So- 

 ciety. By John Ward, R. P. G., F.R.S. N° 495, p. 452. 

 The learned author begins his discourse with observing, that no medals of the 

 Roman emperors, who reigned during the high empire, are more rare, than 

 those of Pescennius Niger ; that they are somewhat scarcer in silver, than in 

 brass ; and that it is the general opinion of antiquaries, there is not one extant 



