Delayed incorporation of H3-thymidine by primordial cells R. D. MacLeodD. Davidson OriginalPaper Pages: 1 - 9
DNA synthesis in the neo-X neo-Y sex determination system of Dichroplus bergi (Orthoptera: Acrididae) Manuel O. DiazFrancisco A. Saez OriginalPaper Pages: 10 - 16
The effect of X-irradiation on male meiosis in Schistocerca gregaria (Forskål) M. Westerman OriginalPaper Pages: 17 - 36
An unusual chromosome system in a leafhopper (Homoptera auchenorrhyncha) M. J. Whitten OriginalPaper Pages: 37 - 41
Sur la structure des chromosomes salivaires de Bilobella massoudi Cassagnau (Collembola: Neanuridae) Paul Cassagnau OriginalPaper Pages: 42 - 58
On the diploid state of the fish order Ostariophysi Jun -ichi MuramotoSusumu OhnoNiels B. Atkin OriginalPaper Pages: 59 - 66
Action de l'acide butyrique sur l'appareil mitotique de segmentation chez Triturus helveticus Raz. Paul Sentein OriginalPaper Pages: 67 - 99
Chromosome patterns and nuclear phenomena in the cycad families Stangeriaceae and Zamiaceae C. J. Marchant OriginalPaper Pages: 100 - 134