vi EDITOR'S PREFACE. 



publication of the work, has rendered necessary. These inter- 

 polations, with the exception of one class, are distinguished by- 

 being included in brackets. I refer to the chemical essays of 

 Simon, written with the view of filling up occasional deficiencies 

 in his ' Chemistry of Man,' and published in his ' Beitrage zur 

 physiologischen und pathologischen Chemie und Mikroskopie.^ 

 This exception was made at the request of Dr. Simon, and 

 its expediency and fairness is unquestionable. The ' Chemistry 

 of Man' was preceded by a volume entitled ' Chemistry of the 

 Proximate Constituents of the Animal Body,' which, being in 

 fact a distinct work, (containing upwards of 500 closely printed 

 pages,) it has been deemed unadvisable to translate in its 

 orig-inal form. A brief Introduction,^ in a great measure 

 based upon it, has been drawn up by myself, with the view of 

 facilitating the perusal of the work to those who have not paid 

 much attention to the recent progress of organic chemistry ; 

 and having written it with this object, I have intentionally 

 excluded many topics which some of my readers may consider 

 should have found a place there. 



The following sketch of the life and writings of the Author, 

 brief though it be, cannot be read without interest. It affords 

 a striking illustration of the results that combined energy and 

 talent are capable of evolving. 



Franz Simon was the son of a sui'geon residing at Frankfort 

 on the Oder, and was born on the 25th of August, 1807. 

 He distinguished himself at a very early age as a skilful 

 apothecary ; and, in volume 32 of ' Brando's Archiv,' we find 

 his essay on the preparation and properties of tinctures, to 

 which one of the Hagen-Buchholz prizes was aAvarded in 1829. 

 Even in this essay we can trace the germs of some of his future 

 speculations in physiological chemistry. The following year he 



' 111 the compilation of the Introdiietioii I am hkcwise much imlehted to Lehmann's 

 ' Manual ot" I'liysiological Chemistry ;' and to Mulder's ' Chemistry of Vegetable and 

 Animal Physiology.' 



