1. A unique fraternity inHabrobracon

   • P. W. Whiting
   • Anna R. Whiting

   OriginalPaper Pages: 311 - 316

2. Analysis of a case of mosaicism in the house-mouse

   • L. C. Dunn

   OriginalPaper Pages: 317 - 326

3. The cytogenetics of fourteen types derived from a single X-rayed sex cell ofNicotiana Tabacum

   • T. H. Goodspeed
   • P. Avery

   OriginalPaper Pages: 327 - 353

4. Derivative types obtained by backcrossingNicotiana Rustica-Paniculata toN. Paniculata

   • W. E. Lammerts

   OriginalPaper Pages: 355 - 366

5. The inheritance of a disease of the accessory nasal cavities

   • Hans Grüneberg

   OriginalPaper Pages: 367 - 374

6. Investigations on the inheritance of immunity to wart disease (Synchytrium Endobioticum [Schilb.] Perc.) in the potato

   • Aksel P. Lunden
   • Ivar Jørstad

   OriginalPaper Pages: 375 - 385

7. The history, origin and characters of certain interspecific hybrids inNolana and their relation toNolana Paradoxa

   • Edith R. Saunders

   OriginalPaper Pages: 387 - 419