ADVERTISEMENT. i x 



this translation, was enthusiastic, and fully sus- 

 tained the high encomiums and anticipations ex- 

 pressed by the translator in one of his letters to 

 the editor ; in whose opinion it would mark the 

 commencement of a new era in physiology. In 

 translating it, he expresses himself, as having ex- 

 perienced the highest admiration of the profound 

 sagacity, which enabled the author to erect so 

 beautiful a structure on the foundation of facts, 

 which others had allowed to remain for so long 

 a time utterly useless, and of the logical structure 

 and extreme cogency of his arguments, . the 

 brightest light being shed upon almost every 

 point in physiology accessible to chemistry, 

 the true path having been opened, leading to 

 the anticipation of the most astonishing results. 

 Dr. Gregory undertook the translation at the 

 express request of the author, and from long 

 and very intimate knowledge of the mind and 

 thoughts, as well as the style of his friend, in 

 addition to his well known acquirements as a 

 chemist and physiologist, was peculiarly fitted 

 for this act of friendship ; with the faithful per- 

 formance of which Dr. Liebig has expressed 

 his high satisfaction. 



