YOL. XLI.] PHILOSOPHICAL TRANSACTIONS. 52S 



being of a martial nature, impregnated with sulpiiur, which gives them a mu- 

 riatic taste.* 



Hence Mr. G. H. concludes that this Westashton water is a very good 

 chalybeate water ; and, by report, more plentiful and more constant all the year 

 round, than the well at Holt, which spring diminishes much at a certain time 

 of the year ; but both seem alike for their virtues, and physical use, being both 

 alike martial. 



An Examination of the Cheltenham Mineral Water. By Conradus Hieronymus 



Senckenberg. N° 46 1 , p. 830. 



From his experiments Mr. Senckenberg inferred that the Cheltenham 

 mineral-water contains Glauber's salt, (sal mirabile Glauberi) mixed with com- 

 mon salt. As for the bitterness of this water, there is (his words are) no other 

 reason for it than the terra cretacea, which is proved by the Epsom salt, where 

 the terra alkalina salis communis, is joined with the acidum vitriolicum ; and 

 after the same manner in the sal mirabile, the alkaline earth causes the bitter 

 taste. He adds that from 1 lb. Troy of this water, he obtained 29 grs. of the 

 said salt, and 3 grs. of earth. -f- 



Of a new Purging Spring discovered at Dulwich in Surrey. By Mr. John 

 Martyn, F.R.S. N° 46l, p. 835. 



Dulwich is a village about 6 miles south of London, at the foot of that ridge 

 of hills which divides the counties of Kent and Surrey. The purging springs, 

 which have been esteemed for about 100 years, and are commonly known by 

 the name of Dulwich waters, have been improperly so called ; those springs 

 arising in a valley on the south side of the hills, in the middle of a large 

 common belonging to the parish of Lewisham in Kent ; whereas Dulwich is on 

 the north side of the hills, in the parish of Camberwell in Surrey. 



In the autumn of 1739, the master of the Green Man public-house, at 

 Dulwich, lying about a mile beyond the village, was desirous to dig a well for 

 the service of his house, there being no spring of good water near it. The 

 well being digged to the depth of 60 feet, and no water appearing, the owner 

 caused it to be covered up, and gave himself no further trouble about it that 

 winter. The following spring, on Mr. M. going down, it was opened, and he 



* In most chemical processes Mr. G. A. Hankewitz was allowed to be sufficiently expert ; but he 

 appears to have been unequal to the task of examining mineral waters, and accordingly he deduced, 

 from a very imperfect analysis, many erroneous conclusions respecting their composition. 



+ It is now known that the Cheltenham mineral water contains a great variety of saline ingredi- 

 ents, such as Glauber's salt, Epsom salt, common salt, magnesia muriata, selenite, &-c. besides iron, 

 carbonic acid, and other gases. 



3x2 



