vi TRANSLATOR'S PREFACE. 



the reader will find a table by which he can, at a glance, 

 discover the degrees, according to Fahrenheit, corresponding 

 with every temperature referred to in this volume. The 

 gramme has now become a recognised standard weight in all our 

 laboratories ; in all the cases where it occurs in this work, sufficient 

 accuracy will be attained if we regard it as equal to fifteen grains 

 and a half. 



The author, in his foot-notes, very commonly refers to German 

 translations or abstracts of French and English Memoirs; in 

 almost every case I have given the corresponding reference to 

 the original source. His numerous references to Dr. Golding 

 Bird's researches are made to Eckstein's translation of a Course 

 of Lectures by that gentleman, which appeared nine years ago in 

 the " Medical Gazette/' and I have deemed it expedient slightly 

 to modify a few sentences in the text, which express views some- 

 what different from those given in the third edition of the 

 " Urinary Deposits." 



If, in a few cases, I have ventured to deviate from the ordinary 

 nomenclature,* I have not done so without due consideration, and 

 without the sanction of the most competent judges. 



I cannot allow these pages to leave my hands without express- 

 ing my general obligation to the Council of the Cavendish Society 

 for the readiness with which they accepted my suggestion, that 

 a translation of Lehmann's " Physiological Chemistry " should 

 appear under their auspices, and for entrusting me with the office 

 of Editor. To Professor Graham, Dr. Hofmann, Mr. Redwood, and 

 Dr. Pereira, I am specially indebted, for much kind aid and many 



valuable suggestions. 



G. E. D. 

 ST. ANDREWS, 



July 9th, 1851. 



* I have, as a general rule, adopted the final syllable ine, both for the true 

 alkaloids, and for those allied substances which are described in the same section, 

 but do not present any very distinct basic characters, as, for example, creatine, 

 allantoine, and cystine. The terminal in refers to neutral bodies, as, for instance, 

 asparagin. I have felt considerable difficulty in the nomenclature of the acids : 

 most commonly I have converted the German antepenultimate in into ic ; thus, 

 Inosins'dure is translated inosic acid (except by inadvertence in p. 50), Vaccins'dure, 

 vaccic acid, &c. 



