NEW EARTHY PHOSPHATE. 85 



It does not feem impoffible to take a fliock of its full force Obfervations on 

 from piles or troughs of different powers, by bringing their g^'v^mim* 

 condaclors very near, but keeping them from a6lual conta£l 

 by pieces of ivory or baked wood : it does not feem fo clear 

 that the full power of combuftion could be preferved in the 

 fame manner. 



I was lately rather furprized to find that galvanifm had the 

 efFedl of making filver remarkably brittle ; this looks as if its 

 action was fomehow conne^ed with the malleability of the 

 perfefl metals, and to fliew that the conducing metals fliould 

 be occafionally palTed through the fire ; the filver plates were 

 nearly clean. 



I will conclude with an obfervatlon on another fubjeft. Attra«aion of 

 Having kept a confiderable variety of Reeves's water-colour [3°'of"cobtu.°^" 

 cakes in a damp clofet, many of the cakes were in fome 

 degree afFeded by it fo as to acquire mold; but the colour 

 that Reeves fells under the name of Royal Smalt, has a moft 

 furprifing power of attrading moifture, as it was reduced moft 

 completely to a foft mafs ; as almoft all the vegetable, animal, 

 and mineral fubftances ufed in painting were in the fame box, 

 we may pretty fairly conclude that an oxide of cobalt furpatTes 

 them all in its power of attrading moifture, and would make 

 a moft delicate hygrometer if fufpended from one arm of a fine 

 beam. 



I am. Sir, 



With much refped. 



Your obedient fervanf, 

 I. R. I. 



VIII. 



On the Prefence of a nexv earthy Phofphnte, found in the Bones of 

 Aiiiinah, ivhich does not exifi in tliofe of Men. By¥ovK^ 

 GROY czrtii V'auq.uf.ljn. Read bcf Ore the National Injiitute.-f 



E flatter ourfclves the Inftitute \vi!} recoiled our labori- Recapitulation 



ous eflays on the analyfis of urine, and ftony concretions found °. '^f analyfis 



in the body of man and animalsj with the ftriking difference No phofphate In 



exifting between them, and the caufe to which the latter is *^^ "'^'"^ °^ 

 ° animals, 



* Qehlen's New Journal of Chemiftjy, 1,555. 



owing. 



