NOTE. 



AT the end of the Appendix will be found an interesting 

 paper by Keller (see page 315), confirming the very im- 

 portant observation of A. Ure, Junior, as to the conversion 

 of benzoic acid into hippuric acid in the human body, and 

 the more recent confirmation of the same by M. Garrod, 

 from the London and Edinburgh Philosophical Magazine 

 for June, 1842. The reader will perceive, that this fact 

 strengthens materially the argument of the Author on the 

 action of remedies. 



It has been deemed advisable to retain in this edition, the 

 notes on page 76, which will not be found in the English 

 edition. They were removed, after the pages were in type, 

 to make room for extending the statement, on page 77, that 

 phosphoric acid " is employed in forming brain and nervous 

 matter, to which it is essential, and, also, no doubt, in con- 

 tributing to the supply of the earthy part of the bones. It 

 is probable, however, that the greater part of the earth of 

 bones is obtained by the direct assimilation of phosphate of 

 lime, while the soluble phosphates are better adapted for the 

 production of nervous matter." And, " The phosphoric 

 acid which, by the change of matter, is separated in the 

 uncombined state, is not expelled from the body as phos- 

 phate of soda ; but we find it in the solid excrements in the 

 form of insoluble earthy phosphates." 



tCJ* For an explanation of the formula; and equations 

 employed in this work, see the Introduction to the Appen- 

 dix, page 267. 



For Tables of corresponding Hessian and English weights, 

 &c., see Organ. Chem. in its Application to Agriculture, 

 3d edition, page 416. 



ERRATA. 



Page 76, line 17, for venous " read " arterial." ' 

 " 110, line 12, for <; circulation " read " cellular tissue." 

 " 271, line 11, for " manuel" read " Manual." 



