340 PHILOSOPHICAL TRANSACTIONS. [aNNO 1747. 



with the various earths and sands from different parts of England, which he at 

 times procured, he thinks that he can exactly match the sand with one from 

 Hampstead heath, and the clay with one from a pit near the lower end of High- 

 gate : the proportions may be easily learned, by accurate observation of the quan- 

 tities of each, where disunited ; and a succedaneum on these principles easily 

 made. 



It is evident, that the only reason why it endures the fire so much better than 

 other clays, is the extreme hardness and great quantity of the sand it contains : 

 and as he imagines it easy to throw a sand of equal hardness, and in equal quan- 

 tity, into an artificial loam, he sees no reason to doubt of making it equally 

 useful. 



On the Relieffound in the Stone from the Use of Alicant Soap and Lime- Water. 

 By Mr. Rob. Lucas. N" 483, p. 463. 



Dr. Morgan advised Mr. L. to drink a pint of lime-water every day. Colonel 

 Morgan and his lady advised him to take 4 pills of alicant soap morning and 

 evening ; on which he resolved to add the soap-pills to the use of the lime-water; 

 only, instead of the quantity proposed, he took between 20 and 30 a day, 

 amounting to near an ounce ; which he thought he might safely do, well know 

 ing that Mrs. Stephens's prescription amounted to almost 3 oz. of soap, besides 

 other ingredients. 



He used with great success stone-lime newly calcined ; but by those experi- 

 ments it should seem, that the dissolving power of lime water made of oyster- 

 shells, is almost double to that of lime-stone. There are two good qualities 

 attending these remedies : the first is, that they are cheap, easily come at, and 

 prepared by one's self. 2dly, that they may be safely used for a long time, with- 

 out danger to health; for a quart of lime-water, and an oz. of soap, had never 

 given him the least nausea, or lowness of spirits, or abatement of appetite, and 

 he was never better in health than at the above date (1747). 



His motive for being so particular in this affair, is a desire to be instrumental 

 of giving ease to others in so unhappy a condition ; being firmly persuaded, that 

 what has already so far relieved him, will dissolve stones of greater magnitude 

 than he supposes his to be. 



On the Figures of some very Extraordinary Calculous Concretions formed in the 

 Kidney of a Woman. By Mr. Charles Lucas at Dublin. N" 483, p. 465. 



These calculous concretions were formed in the left kidney of Mary Anne 

 Mac Mahon, otherwise England, taken out after her death, in the 30th year 

 of her age. They were of very irregular and various forms, mostly resembling 

 many rough pebbles rudely united and cemented together. 



