CONTENTS 



PAGE 



MeDICAL BROTHERHOOD FOR THE FURTHERANCE OF INTERNATIONAL MORALITY. 



S. /. Meltser, President 12g 



The extraction of sap feom plant tissues by pressure. 



Ross Aiken Gortner, John V. Lawrence and /. Arthur Harris. 139 



OxYGEN relations IN AUTOLYSis. Max Morse 143 



Electric apparatus for the automatic control of the flow of gas. 



Sergius Morgults. 146 

 Sanitary studies of baking powders: 



1. Is aluminium absorbable from bread, and similar food products, made 



with alum baking powder ? William J. Gics 151 



2. A comparison of the method proposed by the Association of Official 



Agricultural Chemists as modified by Steel, with that described by 

 Schmidt and Hoagland, for the determination of aluminium in 

 organic material. Paul E. Howe 158 



3. A study of the methods for the quantitative determination of alu- 



minum in blood. L. J. Curtman and P. Gross 165 



4. The determination of aluminum in the presence of iron and organic 



matter. Matthew Steel 173 



5. The detetmination of aluminium in biological material : a comparison 



of the method of Steel (modified by Kahn) with the method of 

 Schmidt and Hoagland Clarence A. Smith and Philip B. Hawk... 183 



6. Comment on the data in the preceding papers (2-5) on the best avail- 



able method for the quantitative determination of aluminium in 

 biological materials. William J. des 189 



7. A direct test of the degree of accuracy of the Schmidt-Hoagland 



method for the quantitative determination of aluminium, 



Arnold K. Balls 195 

 AssociATioNS AND SociETiES. Paul E. Howe and collahorators 203 



1. Society of Public Analysts and other Analytical Chemists. 



P. A. Ellis Richards and E. Richards Bolton, Secretaries. 203 



2. Biochemical Society, England. R. H. A. Plimmer, Sec'y 206 



3. Miscellaneous items of biochemical interest 207 



Biochemical news, notes and comment. 



Benjamin Horowits and collahorators. 215 



Editorials and bock REVIEWS. William J. Gics 249 



Kronecker Biochemical Prize (inside of front cover) 



Professional opportunities for biochemists (inside of back cover) 



The Biochemical Bulletin is a monthly biochemical review. It 

 publishes results of original investigations in biological chemistry, pre- 

 liminary reports of researches, addresses, lectures, criticism, reviews, 

 abstracts of papers, practical suggestions, biographical notes, historical 

 summaries, bibliographies, quotations, questions, news items, proceed- 

 ings of societies, personalia, views on current events in chemical biol- 

 ogy, descriptions of new substances, methods and apparatus — any and 

 all suitable items of personal and professional interest to students, 

 investigators and practitioners of biochemistry. 



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