1. On the variation ofBombus lapidarius L. and its cuckoo,Psithyrus rupestris Fabr., with notes on mimetic similarity

   • W. F. Reinig

   OriginalPaper Pages: 321 - 356

2. The short-wing gene inDrosophila melanogaster, and the effect of temperature on its manifestation

   • Reidar Eker

   OriginalPaper Pages: 357 - 368

3. On the selective consequences of East’s (1927) theory of heterostylism inLythrum

   • R. A. Fisher

   OriginalPaper Pages: 369 - 382

4. A mosaic (dark-eyed intense—pink-eyed dilute) coat colour of the house mouse

   • Horace W. Feldman

   OriginalPaper Pages: 383 - 388

5. Comparative intrapair correlations of fraternal twins and siblings

   • S. G. Levit
   • G. V. Soboleva

   OriginalPaper Pages: 389 - 396

6. Cytological studies in cotton

   • A. Skovsted

   OriginalPaper Pages: 397 - 405

7. On the incomplete dominance of the normal allelomorphs of white inDrosophila

   • H. J. Muller

   OriginalPaper Pages: 407 - 414

8. The genetics of grasshoppers:Chorthippus parallelus

   • F. W. Sansome
   • L. La Cour

   OriginalPaper Pages: 415 - 422

9. A new phenotypic effect of theY-chromosome inDrosophila melanogaster

   • N. P. Dubinin
   • M. A. Heptner

   OriginalPaper Pages: 423 - 446