AUTHOR'S PREFACE. 



THE following lectures are not intended to embrace all the results of 

 physiological-chemical investigation. On the contrary, the aim has 

 been to discuss only those discoveries which are known to be of general 

 interest and importance. All isolated facts, of however great significance 

 for the individual investigator in the field-, of which the value is not 

 fully established and where the connection to other observations is not 

 clearly known, have been intentionally omitted. The lectures should 

 lead to individual thought and serve to incite further investigation and 

 at the same time give one a general survey of the field covered by physi- 

 ological chemistry. Corresponding to this purpose, great care has been 

 used with regard to selecting the literature upon which the lectures are 

 based. It is evident that within the space allotted only a limited 

 number of researches could be cited. The " Zentralblatter " with their 

 abstracts and especially Asho and Spiro's " Ergebnisse der Physiologic " 

 must serve to fill in the gaps. Methods and descriptions of individual 

 compounds are not discussed in detail. It is not possible for any one to 

 work well from brief descriptions. Practical laboratory experience is 

 necessary, and cannot be replaced by anything else. The reader is 

 referred to Felix Hoppe-Seyler's " Handbuch der physiologisch-chemi- 

 schen Analyse " for all such particulars. 



E. ABDERHALDEN. 



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