The University of Chicago Science Series 



The following volumes are bound uniformly 

 in maroon cloth, small 12mo. 



The Evolution of Sex in Plants. By JOHN Merle Coulter. x+140 

 pages. $1.25, postpaid $1.35. 



Individuality in Organisms. By Charles MANNING CHILD, x+212 

 pages. $1.50, postpaid $1.65. 



The Origin of the Earth. By Thomas C. Chamberlin. xii+272 pages. 

 $1.75, postpaid $1.85. 



Finite Collineation Groups. By Hans F. BlicHFELDT. xii+194 pages. 

 $1.50, postpaid $1.60. 



The Biology of Twins. By HoRATio Hackett Newman. x+i86 

 pages. $1.50, postpaid $1.60. 



The Physiology of Twinning. By HoRATIO Hackett NewmaN. x+232 



pages. $1.75, postpaid $1.85. 



Food Poisoning. By Ed WIN Oakes Jordan. viii+ii6 pages. $1.25, 

 postpaid $1.35. 



The Electron: Its Isolation and Measurement, and the Determination of Some 

 of Its Properties. By ROBERT ANDREWS MiLLiKAN. xii+ 268 pages. 

 $1.75, postpaid $1.85. 



The Living Cycads. By CHARLES JOSEPH CHAMBERLAIN, xiv+172 

 pages. $1.50, postpaid $1.60. 



Problems of Fertilization. By FRANK R. LiLLIE. xii+278 pages. $1.75, 

 postpaid $1.85. 



The Origin and Development of the Nervous System from a Physiological 

 Viewpoint. By Charles M. Child. xviii+296 pages. $1.75, 

 postpaid $1.85. 



The Story of the Maize Plant. By PAUL WEATHER WAX. xvi+ 248 pages. 

 $1.75, postpaid $1.85. 



The Antiquity of Disease. By ROY L. MOODIE. xiv+l5opages. $1.50, 

 postpaid $1.60. 



Algebras and Their Arithmetics. By LEONARD E. DiCKSON. xii+242 

 pages. $2.25, postpaid $2.35. 



Protoplasmic Action and Nervous Action. By Ralph S. Lillie. xiv+417 

 pages. $3.00, postpaid $3.10. 



THE UNIVERSITY of CHICAGO PRESS 



CHICAGO' ILLINOIS 



