CONTENTS. 



I. The Origin of Gynandromorphs. By T. H. Morgan and C. R. Bridge; 



PAGE. 

 S 1 



Frequency of Occurrence of Gynandromorphs 



Relative J^equency^ of Elimination of the Matcrnai' and' Paternal '" Sex 



Distribution of Segmentation" Nuclei 'as deduced 'from' Distribution of'the ^^ 



Characters of Gynandromorphs v> 



Starting as a Male vs. Starting as a Female ,^ 



Cytological Evidence of Chromosomal Elimination.. \\ 



Earlier Hypotheses to explain Gynandromorphs. ... \t 



The Origin of the Germ-cells in FUes ^^ 



Courtship of Gynandromorphs o 



Phototropism in Mosaics with one White and one Red Eye 9? 



Sex-limited Mosaics " ^'^ 



Somatic Mosaics _\ '^^ 



Somatic Mutation ^^ 



Mosaics in Plants ^'^ 



Classification and description of Gynandromorphs oi Drosophila 11 



Gynandromorphs approximately bilateral ^J 



Gynandromorphs mainly female ^f 



Gynandromorphs mainly male y. ^ ^ 



Gynandromorphs roughly "fore-and-aft" ^ 



Gynandromorphs produced by XX Y females. ... „ 



Gynandromorphs of complex type [ \ Jt 



Special Cases ^^ 



Gynandromorphs with incomplete data ^I 



Drosophila Gynandromophs previously published 70 



Gynandromorphs and Mosaics in Bees If 



Gynandromorphs in Lepidoptera ot 



Other Insects «. 



Spiders '.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'..'. 94 



Crustacea „_ 



Molluscs ■''.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'..'. q? 



Echinoderms no 



Vertebrates r»Q 



Fishes y^y^y.'.'.'.'.'.'.'.'.'.'.'.'.'..'. it 



Amphibia qo 



Reptiles . ^, 



Birds yyyyyyy.y:::::::::::.: Z 



Mammals — Man -.f^f. 



Is Cancer a Somatic Mosaic? ' .' j"^ 



Is the Freemartin a Gynandromorph? 1 JJn 



Summary p'' 



Literature Cited JP 



116 



II. The Second Chromosome Group of Mutant Characters. By C. B. Bridges and 



T. H. Morgan . „„ 



Introduction " " ' |^^ 



Chronological hst of the II Chromosome Mutations 1 2fi 



Map of Chromosome II ,0^ 



Speck ;:;;;;;; 127 



Ohve J28 



Truncate J^J 



Truncate Lethal ti^ 



Snub .y.'.''.'.y.'.'''.'.'.'.'.'.'.'.'.'.'.'.'.'.'.[ HO 



Truncate Intensification by Cut 143 



III 



