48 PHILOSOPHICAL TRANSACTIONS. [aNNO 1750. 



It came from the fauces. After this he was informed he brought off with diffi- 

 culty another tubular membrane of some length ; and whenever he had strength 

 to expectorate, little bits of the same were observed mixed with a very slimy 

 mucus. He lived 2 1 hours after the second coat was drawn from him, and died 

 in the end somewhat suddenly, though in his perfect senses. Dr. S. adds, that 

 he never saw one in this disorder attacked with a delirium.* 



Of the Strength of several of the principal Purging Waters, especially of that 

 of Jessop's fVell. By the Rev. Ste. Hales, D. D. and F. R. S. IViih a 

 Letter from Swithin Adee, M. D., F. R.S. on the Virtues of the said [Fell, 

 N° 495, p. 446. 



An account of the several quantities of sediment which were found in a 

 pound Avoirdupois of the following purging waters, evaporated away to dryness, 

 in Florence flasks, cut to a wide mouth; viz. 



Marybone fields, near London, 24 grains. Peter-street brewhouse, Westminster, 

 27; Ebsham 34; Scarborough 40; — And it was found nearly the same by Dr. 

 Shaw and Dr. Short: a little more or less according to the wetness or dryness of 

 the seasons, y.,- of this in calcareous matter; the rest, mostly what is called 

 nitrous salts, on account of the oblong crystals which it shoots into. — Dog and 

 Duck, Lambeth 40-^ grains; Kilbum, 4 miles from London, in the way to 

 Edgeware 43; Acton 44; Cheltenham, Gloucestershire, 60. 



Dr. Short found the following proportions in Cheltenham water, viz. — Sept. 

 1738, calcareous sediment -r4.-5- of 74 grains; Dec. 1738, -^of42; July 1739, 

 TT "^ 70 ; He says it is the best and strongest nitro calcareous water in England, 

 very bitter, having only a little subtile impalpable earth, mixed with its salt. 



Cobham well, a mile south of Church Cobham, Surrey, once 68 grains, ano- 

 ther time 60 grains. 



Jessop's well, on Stoke Common, in Mr. Vincent's manor, about 3 miles 

 southward of Claremont, Surrey, Sept. 11, 1749, after long dry weather, 82 

 grains in a pound of the surface water; Oct. 16, after a considerable quantity of 

 rain, the surface water yielded but 60 grains. Nov. 21, the surface water yielded 

 65 grains. 



This great inequality of the strength of the surface-water put him upon trying 

 whether the water at the bottom of the well, near the springs, were stronger 

 than the surface-water. And he found that the lower water yielded 82 grains, 

 the surface-water only 48 grains; and it was the same on a second evaporation of 



* The case last described was evidently a case of cynanche trachealis or croup ; but some of the 

 preceding observations in Dr. Starr's paper, seem to relate to the cynanche maligna or gangrenous 

 sore throat. 



