^oyal Society, 4b7 



Silver ball be 90 centesiinal degrees hotter than the encir- 

 cling air, the effect of the vertical stream is tripled, or the 

 aggregate expenditure, from the painted and from the naktd 

 surface, will he expressed by 50 and 41, the dissiiiatiun 

 arising from the increased flow of the medium amounting 

 in each of ihem to 30. By a singular coincidence, this 

 proportion is precisely the same as what obtains near the 

 equilibrium of temperature in an atmosphere of hydrogen 

 gas. But hydrogen gas betrays in its own constitution still 

 greater modifications. At the same elevation of QO cen- 

 tesimal degrees of temperature, the combined powers of 

 cooling which its exerts on the contrasted surl'aces, are ex- 

 pressed by 170 and 16 1. — It would be fatiguing, however^ 

 to pursue this Intricate analysis much further." 



LXIX. Froceedings of Learned Societies, 



ROYAL SOCIETY. 



May 27. — JC/ARL Morton in the chair. — Mr. Brande, 

 through the medium of the Society for promoting Animal 

 Chemistry, furnished some additional observations on the 

 use of masjnesia and acids in the case of calculous diseases, 

 where alkalies had failed or proved injurious. He related 

 the case of a gentleman of the law, uho was closely con- 

 fined to business during terms, and in conse(juence of such 

 sedentary habits snflered severely by calculi. The use of 

 magnesia in this and several other cases effecttd a comi)iete 

 cure, even where the patients suffered by the passage of 

 stones from the kidneys to the bladder, and where the use 

 of alkalies had only aggravated their suflTerines by impairing 

 the digestive powers of the stomach. In all such cases, 

 however, the stone or gravel consisted of uric acid and 

 phosphate of lime, which were recognised by the red colour 

 of the urine and its sediment. But another species of cal- 

 culus was discovered by Dr. Trolleston about fifteen years 

 ago, being a triple salt and consisting of ammoniacal mag- 

 nesian phosphate of lime. No remedy has hitherto been 

 proposed for it. 'i'his calculus is known by its whiteness, 

 the whitish sediment, and the thin shining crystalline pel- 

 licle swimming oii the urine. It is not soluble by magne- 

 sia, but yields to tlie muriatic, cilric, and carbonic acida : the 

 latter was found the most effectual, and least offensive to the 

 stomach. 



June 3. — The conclusion of Mr. Brande's paper was 

 read, and the result of his observations and experiments 



must 



