SCIENCE 



vrfT„«7 Friday, August 29, 1919 sh-gle copies, 15 c^ 



VOL. L, No. 1287 ' ' Ankual SnBSCBlPTIOS, $5.M 



SEVENTH EDITION 



Howell's Physiology 



This work has been a recognized leading text-book for years. It is now used 

 as the text in j^ per cent, of the medical schools. In its preparation, Dr. 

 Howell has thoroughly digested the entire literature of physiology, summariz- 

 ing the important views and conclusions. In this way you get the full benefit 

 of the latest research work of the -world's physiologists. 



With the one aim of making his book really valuable to the student, Dr. Howell 

 lays main emphasis on those facts and views that bear directly on general path- 

 ology and the practical branches of medicine. 



He gives here the new work on metabolism, the new physiologic laws and the 



revolutionary changes produced by the advances of physiologic chemistry, and 



modern chapters on the ductless glands and internal secretions. 



By William H. Howell, Ph.D., M.D.. Professor of Physiology in the Johns Hopkins University, Baltimore. 

 Octavo of 1059 pages, containing 306 illustrations, many in colors. Cloth, $5.00 net. 



Jordan's General Bacteriology sixth edition 



In this work there are extensive chapters on methods of studying bacteria, including 

 staining, biochemical tests, cultures, etc,; on development and coraposition of bacteria; 

 on enzymes and fermentation products ; on the bacterial production of pigment, acid, 

 and alkali ; and on ptomains and toxins. 



Octavo of 691 pages, illustrated. By Edwin O. Jordan, Ph.D., Professor of Bacteriology in the University 

 of Chicago. Cloth, $4.00 net. 



Fred's Soil Bacteriology 



The exercises described in this book are arranged primarily for students of soil bacteri- 

 ology, soil chemistry and phj'sics, and plant pathology. As far as possible the experi- 

 ments are planned to give quatititative results. It is truly a valuable laboratory manual 

 — worked out by a teacher and based on the student's needs. 



i2mo of 170 pages, illustrated. By E. B. Fred, Ph.D., Associate Professor of Agricultural Bacteriology, 

 College of Agriculture, University of Wisconsin. Cloth, $1.25 net. 



Prentiss and Arey's Embryology second edition 



This work has been extensively revised and entirely reset. The actual descriptions have 

 been recast and rearranged, a new chapter on the morphogenesis of the skeleton and 

 muscles has been included, and thirty-nine illustrations replace or supplement certain of 

 those in the former edition. The illustrations form an instructive feature. 



Large octavo of 411 pages, with 388 illustrations. By Charles W. Prentiss, Ph.D., formerly Professor of 

 Microscopic Anatomy, and Leslie B. Arey, Ph.D., .Associate Professor of Anatomy, Northwestern University. 



Cloth, $4.25 net. 



W. B. SAUNDERS COMPANY Philadelphia and London 



