1. Evidence on the time of chromosome pairing from the preleptotene spiral stage in Lilium longiflorum “Croft”

   • Marta Sherman Walters

   OriginalPaper Pages: 375 - 418

2. Meiotic prophase in anthers of asynaptic wheat

   • L. F. La Cour
   • B. Wells

   OriginalPaper Pages: 419 - 427

3. The distribution of sister chromatids at mitosis in Chinese hamster cells

   • David E. Comings

   OriginalPaper Pages: 428 - 433

4. Quantitative autoradiography of heterochromatin replication in Microtus agrestis

   • David E. Comings

   OriginalPaper Pages: 434 - 445

5. A non-doubling DNA series in somatic tissues of the locusts Schistocerca gregaria (Forskål) and Locusta migratoria (Linn.)

   • D. P. Fox

   OriginalPaper Pages: 446 - 461

6. The gregarisation pheromone of locusts

   • D. J. Nolte
   • I. R. May
   • B. M. Thomas

   OriginalPaper Pages: 462 - 473