xii CONTENTS 



Conjugation — The macronucleus during conjugation — 

 Conjugant meiosis — Literature cited 



XIII. Endomixis By Lorande Loss Woodruff, Yale Uni- 

 versity 646 



Macronuclear reorganization — Endomictic phenomena — ■ 

 Autogamy — Periodicity of endomixis — Genetical studies 

 on endomixis — Conckisions — Literature cited 



XIV. Sexuality in Unicellular Organisms By T. M. Sonne- 



born, University of Indiana GGG 



Sexuality in Cblamydomonas — The kinds of gametic 

 differences observed in Cblamydomonas — The nature of 

 the physiological differences between gametes in 

 Chlamydomonas — Interpretation of the sexual phe- 

 nomena in Chla?77ydomonas — Sexuality in Paramecium 

 and other ciliate Protozoa — Sexual differences between 

 conjugant individuals — Mating types in relation to the 

 Maupasian life cycle — The role of environmental con- 

 ditions in determining conjugation — Sex differences be- 

 tween gamete nuclei — Significance of the diversities be- 

 tween conjugants and between gamete nuclei — Literature 

 cited 



XV. Inheritance in Protozoa By H. S. Jennings, Univer- 

 sity of California, Los Angeles 710 



Types of reproduction and inheritance — Inheritance in 

 uniparental reproduction — Material processes — Inheri- 

 tance of characteristics — Changes in inherited characters 

 in uniparental reproduction — Age changes, sexual imma- 

 turity, and maturity — Inherited degenerative changes re- 

 sulting from unfavorable conditions — Inherited acclima- 

 tization and immunity — Inherited environmental modifi- 

 cations in form and structure — Variation and its inheri- 

 tance occurring without obvious action of diverse en- 

 vironments — Summary and interpretation — Inheritance 

 in biparental reproduction — Biparental inheritance in 

 haploids: Flagellata — Sex inheritance and sex-linked in- 

 heritance — Biparental inheritance in diploids: Ciliata — 

 Inheritance of mating type in Paramecium aurelia — In- 

 heritance of mating type in Paramecium bursaria — Effect 

 of the cytoplasm and its relation to nuclear constitution — 

 Literature cited 



