Xiv CONTENTS 
CHAPTER XII 
OENOTHERA AND THE MUTATION THEORY 
The Mutants of Oenothera Lamarckiana : oy 4% . 2... 808 
Chromosome Aberrations of Oenothera . ......... 310 
Gametic and Zygotic Lethals. .........2.. .  . 812 
Pseudo-mutations by Crossing-over . ......... . 316 
‘BIBIIOGRAPHY = ah), Gg hb Ss ew Gv eS a 321 
