JOURNAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY 



DECEMBER 1000. 



SUMMARY OF CUEEENT EESEAECHES 



Melating to Zoology and Botany (principally Invertebrata and Crypto- 

 gamia), Microscopy, &c, including Original Communications from Fellows 

 ■and Others* 



ZOOLOGY. 



VEETEBEATA. 



a. Embryology-t 



Transplantation of Ovaries.! — Dr. A. Herlitzka experimented with 

 forty guinea-pigs of both sexes into which the ovaries of adult females 

 of the species were transplanted. In all cases, equally in the two 

 sexes, the transplanted ovarian tissue degenerated ; in one case a normal 

 ovum appeared to survive. The adaptability of the tissues of the trans- 

 planted ovary is greater with the more dilferentiated (the connective) 

 and less with the more " specific " (the germinal) tissue. Adaptability 

 is in inverse ratio to " Specificitat." The degeneration of transplanted 

 ovary depends mainly on the unpropitious or unsuitable " idioplasmic " 

 influences of the new somatic environment, to which the germ-plasm is 

 especially susceptible. Herlitzka criticises the work of Schultz § who 

 -claims to have succeeded in five cases of transplantation. If these be 

 accepted, along with two reported by Gregorieff, and the one case noted 

 above, there are eight cases of success as against fifty-seven of failure. 



Structure of Mammalian Ovum.|| — Dr. Alexander Gurwitsch finds 

 that the so-called yolk-nucleus of the young ovocyte in the guinea-pig 

 is a true sphere in van Beneden's sense, that is, it consists of a mass of 



* The Society are not intended to be denoted by the editorial " we," and they do 

 not hold themselves responsible for the views of the authors of the papers noted, 

 nor for any claim to novelty or otherwise made by them. The object of this part of 

 •the Journal is to present a summary of the papers as actually published, and to 

 describe and illustrate Instruments, Apparatus, &c, which are either new or have 

 not been previously described in this country. 



f This section includes not only papers relating to Embryology properly bo called, 

 but also those dealing witli Evolution, Development, Reproduction, and allied subjects. 



t Biol. Centralbl., xx. (1900) pp. 619-24. Festschrift Luciani, Milan, 1900. 



§ Centralbl. Allg. Pathol , xi., April 1900. 



[| Arch. Mikr. Anat., l?i. (1900) pp. 377-92 (1 pi.). 



Dec. 19th. 1900 2 Y 



