157 



SUMMAKY OF CURRENT RESEARCHES 



RELATING TO 



ZOOLOGY AND BOTANY 



Cprincipally invertebrata and cryptogamia), 



MICEOSCOPY, Etc.* 



ZOOLOGY. 



VERTEBRATA. 



1. Emtoryologry, Evolution, Heredity, Reproduction, 

 and Allied Subjects. 



Pseudo-parthenogenesis in Human Ovum. — L. Hoche and R. 

 MORLOT (Comptes Retidus Soc. Biol. 11)20, 83, 1152-4). In a ripe 

 Graafian follicle in a girl of twelve, operated on for ovarian hernia, there 

 was found an ovum with distinct nuclear and cytoplasmic segmentation, 

 as if indicating the beginning of parthenogenetic segmentation. But 

 the cell-formation did not show the normal chromatin constitution and 

 represented little more than a sort of struggle against death. The 

 phenomenon was to be regarded as among the varieties of cellular 

 degeneration and death. J- A. T. 



Development of Uterine Glands in Man. — E. A. BaumCtARTXer, 

 M. T. Nelson and Wm. Dock {Amer. Journ. Anat, 1920, 27, 

 20;-5-19, 7 figs.). Glands are found in the corpus of the uterus in a six- 

 to seven-month foetus. The earliest are small irregular outpouch ings 

 from the semilunar mucosal folds, subsequently developing constricted 

 necks and enlarged end-pieces similar to many other gland rudiments. 

 The necks persist even to the adult stage ; the enlarged ends become 

 tubular and divide T-like,with sometimes a second longitudinal division 

 of the end branches. The stalks follow an oblique course in the adult, 

 sometimes almost a spiral one. Xear the muscle layer the branches run 

 parallel to the surface and all in one direction, sometimes forming a net- 

 work by anastomoses of different branches. The greater part of the 

 glandular tissue lies in the lower one-third or one-fourth of the endo- 

 metrium. Adult uterine glands are compound, anastomosing, tubular 

 glands. J- A. T. 



* The Society does not hold itself responsible for the views of the authors 

 of the papers abstracted. Ths object of this part of the Journal is to present 

 a summary of the papers as actually imhlishrxl, and to describe and illustrate 

 Instruments, Apparatus, etc., which are either new or have not been previously 

 described in this country. 



