SCIENCE 



New Series 



Vol. LII, No. 1337 



Fkiday, Augi5st 13, 1920 



Single Copies, 15 Cts. 

 Annual Subsckiption, $6.00 



Heredity And Evoluti\ In 

 Plants p 



By C. STUART GAGER 



Director Brooklyn Botanic Garden, Brooklyn, N. Y ., Author of 



" Fundamentals of Botany" ; "A Laboratory Guide 



for General Botany," etc. 



113 Illustrations. 12mo, xv+265 Pages. Cloth, $1.25 Postpaid 



AGONCISE treatment suited to beginning students 

 and to more general readers. The chapter on Ex- 

 perimental Evolution has received the approval of the 

 author of the mutation theory as being an accurate 

 presentation of the essentials of that theory. 



Contents in Brief: Life History of a Fern; Funda- 

 mental Principles; Heredity; Experimental Study of 

 Heredity; Evolution; Darwinism; Experimental Evo- 

 lution; Evolution of Plants; Geographical Distribution; 

 Paleobotany ; Evolution of Plants, Concluded ; Great 

 Groups of Plants ; Bibliography. 



