184 ON THB COMPOSITION AND USE OF CHOCOLATE. 



acids which combine with it and form falts, the greater num* 

 ber of which, fuch as the phofphate and oxalate are but little 

 foluble, it frequently produces diforders in the moft necefiary 

 organs of life ; it is known that it is the bafe of moft of the 

 urinary calculi and arthritic concretion. It is therefore highly 

 important to the progrefs of medicine, to examine the aliments 

 which contain this earth, in an oftenfible manner. The Citi- 

 zens Vauquelin and Alexander Brogniart, found it in abundance 

 in bread : I have difcovered it in chocolate. 



'? Citizen Delaville, in a memoir which made part of the 

 hundred and twenty-fecond number of the Annates de Chemie, 

 fays, fpeaking of the fap of cabbages, " this fap evaporated 

 yields a confiderable quantity of fulphate of lime, the fap of 

 radithes affords refults nearly fimilar." 



" Here then are four aliments which are frequently era- 

 ployed at the fame time, and which carry into the pafiages of 

 digeftion a confiderable quantity of lime. Other inftances 

 might be cited, fuch as ciders ameliorated by the merchants 

 with chalk, and I have thought thefe facts were not unworthy 

 of the attention of phyficians. It is the aflerablage of fuch 

 obfervations, trifling in appearance, which frequently explain 

 the caufe of the phenomena belonging to phyfiology. Nothing 

 ftiould be neglected in animal chemiftry, the principal aim of 

 which is the prefervation of our health and the annihilation of 

 the moft dreadful maladies which afflict human nature. 



VI. 



On the Caufes by which the Oxigen of the Atmofphere isfupplied 

 or renovated. In a Letter from Mr. Robert Harrvp. 



To Mr. NICHOLSON. 

 S I R, 



IF you think the inclofed paper of fufficient importance to 

 meet the public eye, be fo kind as to give it a place in your 

 valuable and interefting Journal, 



I am, Sir, 



your obedient humble fervant, 

 ROBERT HARRUP, 

 Chobham, June 22, 18Q3, 



WHEN 



