SoUee to S«d<lar.— When you finish rxadlnfi 

 this Dugaiine, place a 1 cent stamp on this notic«, 

 mail the magazinet and it will be placed in tUa 

 hands of onr soldiers or sailors 



No wrapping— No Address. 



SCIENCE 



New Skbies li^nTniv ATav 9 1Q1Q Sikoib Copiks, ift Cts. 



Vou XLIX, No. 1270 r KIUA.X , a±A.x ^, laia AmfDAi SiB^-BiKriON, SftOO 



Saunders' Booka 



i\th$«n, 



lit}/: 



Jordan's General Bacteriology sLSTi,\y,pAy 2 



In this work there are extensive chapters on'methods of studjing bacteria, includin^^;i^ 

 ing, biochemical 1e»t8, cultures, etc.; on enzymes and fermentation products; oiN^ntP>j , 

 bacterial production of pigment, acid, and alkali; and on ptomains and toxins. ^"^CT^ ^ 



Octavo of 6'Jl pages, iUuatialed. By Edwin O. Jordan, Ph.D., Professor of Bacteriology in the Univpn<i»y 

 of Chicago. Cloth, $3.75 uei. 



Fred's Soil Bacteriology 



Prentiss and Arey's Embryology .m- 



The exercises described in this book are arranged primarily for students of soil bacteriolojry, 

 soil chemistry and pliysics, and plant pathology. As far as possible the experiments a.e 

 planned to give quanXi.ai.ixe results. 



12tno of 170 pages, illustrated. By E. B. Frbd, Ph.D., Associate Professor of Agricultural Bacteriology 

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



n- y^d) EDITIOX 



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

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

 has been included. 



Large octavo of 411 pages, with 3S8 illustrations. By Charles W. Prentiss, Ph.D., formerly Professor of 

 Microscopic Anatomy, and Leslie B. Ahet. Ph.D., Associate IProfeaaor of Anatomy, Northwestern Uni- 

 versity. Cloth, $4.00 net. 



Arey's Laboratory Histology 



Professor Arey treats his subject strictly on an' indudion basis. He leads the student to 

 scrutinize, explain, and reach conclusions for himself. 



12rao of 81 pages. By Leslie B. Arey, Ph.D., Associate Professor of Anatomy, Northwestern Uaiversity. 



Cloth, $1.00 net. 



McFarland's Biology 



SJiCOXP EDITION 



NEW ijd) EDITION 



This work takes up Living Substance generally. There are chapters on the cell, reproduc- 

 tion, ontogenesis, conformity to type, divergence, structural and blood relationship, parasi- 

 tism, mutilation and regeneration, grafting, senescence, etc. 



12nio of 457 pages, illustrated. By Joseph McFabland, M.D., Professor of Pathology and Bacteriology, 

 University of Pennsylvania. Cloth, $1.75 net. 



Drew's Invertebrate Zoology 



Professor Drew's book gives you a working knowledge of comparative anatomy and an ap- 

 preciation of the adaptation of animals to their environments. 



12mo of 213 pages. By Gilma-v A. Drew. Ph.D., Assistant Director of the Marine Biological Laboratory, 

 Woods Hole, Mass. Cloth, $1.25 net. 



Daugherty's Economic Zoology neh- y,d) EnmoN 



This work 's issued, for convenience, in two parts. Part I is a Fidi and Laboratory Guide, 

 interleaved for notes. Part II is the text-book part or the Principles. The life and habits 

 are emphasized. The work has been thoroughly revised. 



By L. S. DAnoHERTT, M.S., Ph.D., Professor of Science, Missouri Wcsleyan College; andM. C. Dadghertt. 

 Part l— Field and Laboraioru Guide. 12mo of 275 pages, interleaved. Cloth, $1.25 net. Part II— Prtn- 

 cipUt. 12mo of 406 pages, illustrated. Cloth, $2.00 net. 



W. B. SAUNDERS COMPANY, Philadelphia and London 



