314 



In il very recent paper Champy (C. R. Soc. de Biologie, Seance 

 dii 17 Février 1923) communicates that he lias obtained Sticklehacks 

 {aculeatux) with nuptial colours last winter and that in the testes 

 of these animals he had not observed a well-developed interstitial 

 tissue. As he has not found any interstitial cells in the testes of 

 various species of tishes with distinct secondary sex-characters, 

 Champy is of opinion that these cell.s have no influence on the 

 development of those sex-characters and that the formation of the 

 hormones responsible for the development of these characters would 

 take place bj means of the sexual cells. 



Finally, I will once more call attention to the fact that the testes, 

 examined by me, in which the spermatogenesis has almost come 

 to an end, possess a more strongly developed interstilium than testes, 

 in which the spermatogenesis is still in full swing. Possibly this 

 fact points to a correlation between spermatogenesis and interstitial 

 cells. Whether the sex-hormones are formed in the seminiferous 

 tubules as well, 1 cannot decide at this moment. Ijaler on, when 

 1 have more material at my disposal, I hope to recur to this 

 subject in a more detailed paper. 



Zoöloyical Laboratory of the Veterinary College. 

 Utrecht, March 1923. 



REFERENCES. 



Bascom, K. F. 1923. Tlie interstitial cells of the gonads of cattle, with especial 



reference to their embryonic development and significance. Amer Journal 



Anat., vol. 31. 



BouiN, P. et Ancel, P. 1903 Recherches sur les cellules interstitielles du testi- 



cule des Mammifères. Arch, de Zool. expér. et génér., 4e Série, T. 1. 



-J Champy, Ch. 1923. Observations sur les caractères sexuels chez les Poissons. 



G. R. Soc. de Biol., T. 88, pag. 414. 

 j CouRRiER, R. 1922«. Sur l'indépendence de la glande séminale et des caractères 

 sexuels secondaires chez les Poissons. Etude expérimentale. G. R. Acad. des 

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 ^ CouRRiER, R. 1922Ö. Etude préliminaire du determinisme des caractères sexuels 

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 LiPscHÜTZ, A. 1919. Die Pubertatsdrüse und ihre Wirkungen. Bern, Verlag von 



E. BiRCHER. 



Steinach, E. 192U. Künstliche und natilrliche Zwitterdrüsen und ihre analogen 



Wirkungen. Archiv f. Entw. Mech., Bd. 46. 

 Stieve, H. 1921. Entwickelung, Bau und Bedeutung der Keimdrüsenzwischenzellen. 



Ergebnisse der Anat. und Enlwickelungsgescliichle, Bd. 23. 

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