No abstract

Fluctuations in the frequency of sex appendages in the polymorpho-nuclear neutrophil leucocytes were studied in 10 women at different phases of the menstrual cycle. These fluctuations, which are statistically significant, seem to show that the proportion of sex appendages depends on hormonal factors acting during the menstrual cycle.

SUMMARYTransplants of vesical mucous tissue in the dog to an animal of opposite sex keep their own sex karyotype.This seems to prove—to the contrary of what takes place for leucocytic sex corpuscles—that the sex karyotype of some cells does not undergo alterations under the action of hormone impregnation.

No abstract

A pericentric inversion in the number two autosome was produced by sperm irradiation, and isolated in a line of birds. Morphology of the autosome changed from markedly submetacentric (arm ratio 0 . 5 8) to almost metacentric (arm ratio 0 .8 0 ). Examination