CONTENTS 



PAGE 



Scientific truth and the scientific spirit. A. B. Macallum. 65 



The " retrograde circulation of calcium " in the human 



BODY. G. Delgado Palacios 78 



A simple, EFFICENT, and economic FILTER. 



5*. L. Jodidi and E. H. Kellogg 87 



StUDIES ON THE RELATION OF CEMENT DUST TO CITRUS VEGETA- 

 TION. I. The EFFECT ON PHOTosYNTHESis. H. D. Young. 95 

 AssociATiONs AND sociETiES. Paul E. Howe and collaborators. . loi 



1. Soc. Public Analysts, ETC. E. Richards Bolton,Secy. loi 



2. BiocHEMicAL Society, England. 



R. H. A. Flimmer, Secy. 109 



3. MiSCELLANEOUS ITEMS OF BIOCHEMICAL INTEREST HO 



BiOCHEMICAL NEWS, NOTES AND COMMENT 



Benjamin Horowits and collaborators. 115 



Editorials AND BOOK REVIEWS. William J. Gies 126 



Kronecker Biochemical Prize {inside of front cover) 

 Professional opportunities for biochemists 



(inside of back cover) 



