PROGRESS IN AGRICULTURAL EDUCATION. 285 



the Bureau of Chemistry of this Department, who took up the 

 Microscopical ISIethods for Detecting Adulteration in Feeding Stuffs. 

 Doctor Winton outlined the technique of such microscopical work 

 and discussed methods, showing in detail how it is possible to identify 

 adulterants by differences in their structure as shown by the micro- 

 scope in comparison with the standard food materials. In the 

 weekly seminar opportunity was given for demonstrating in greater 

 detail his methods and their ai)plication. 



Doctor jMendel gave five lectures and two seminars during the 

 following week. The first of the lectures discussed the Chemical 

 Processes of the Alimentary Tract, the second Recent Progress in 

 Chemistry of the Proteins and its IJelation to the Problems of Nutri- 

 tion, and the remaining three Intermediary Metabolism, taking up 

 some aspects of the intermediary metabolism of nucleoproteins and 

 purins and of the carbohydrates and also discussing the biochemical 

 functions and protective mechanisms. The lectures well illustrated 

 the very marked progress in physiological chemistry within the last 

 few years, and directed attention to a very large amount of material 

 which is not readily accessible, but which is of the greatest impor- 

 tance to students of animal and human nutrition. The lectures were 

 also noteworthy in that they demonstrated clearly the possibility 

 of applying physiological methods to the study of practical problems 

 and to both the important relation of many researches along other 

 technical lines to nutrition and the important application of experi- 

 ment station problems to many investigations in medicine, pathology, 

 and other branches to which the attention of the experiment station 

 worker might not ordinaril}' be directed. 



Director Armsby gave the five lectures of the third week, the main 

 topics being a general survey of the chemical constituents of plants 

 and animals, the physiology of nutrition, feeding stuffs, and feeding. 



The fourth week of the course was occupied by Professor Ziintz, 

 who gave five lectures and held two seminars. In the lectures Pro- 

 fessor Ziintz discussed particularly Muscular Action, its Different 

 Forms and its Influences on the Quantity and Quality of Metabol- 

 ism; The Different Forms of Internal Labor Performed by the Rest- 

 ing Organism and their Influence on Metabolism; the Influence of 

 Internal and P^xternal Temperature on Metabolism; and Aims and 

 Methods of Research Regarding the Respiratory Process (2 lectures). 

 These lectures, which were of unusual interest, summarized and 

 discussed the results of his extended researclies on metabolism in 

 men and animals, particularly the work with the respiratory quo- 

 tient carried on by means of the valuable aj^paratus which he has 

 devised. Professor Ziintz brought with him from Berlin the respir- 

 atory quotient apparatus, and in the seminars as well as in the lec- 

 tures demonstrated methods of using it and also special a[)paratus 



