INTERSTITIAL CELLS OF URODELE TESTIS 269 



b. The absence of interstitial cells in the sexually immature 

 male further precludes their recognition as a distinct cell type. 



c. These cells cannot be considered as constituting a gland in 

 the morphologic sense of the term. 



6. There has been found no evidence that the interstitial cells 

 constitute a gland of internal secretion. 



a. Secretion products other than lipoid substances have not 

 been observed. 



h. Interstitial-cell development bears no constant relation to 

 the mating period and its phenomena. 



c. The maturation phenomena appear in no way dependent 

 upon the presence of interstitial cells; neither do they always 

 immediately follow the disappearance of these elements. 



7. The value of the interstitial cells to the organism during 

 their period of hypertrophy remains problematic. 



LITERATURE CITED 



Allen, B. M. 1904 The embryonic development of the ovary and testis of the 



mammals. Am. Jour. Anat., vol. 3, p. 89. 

 Bell, W. Blair 1916 The se.\ complex. New York. 

 Bensley, R. R. 1911 Studies on the pancreas of the guinea-pig. Am. Jour. 



Anat., vol. 12, p. 297. 

 BiEDL, Arthur 1913 The internal secretory organs: their physiology and 



pathology. English translation. Wm. Wood & Co., New York. 

 Boring, A. H., AND R. Pearl. 1917 Sex studies. IX. Interstitial cells in the 



reproductive organs of the chicken. Anat. Rec, vol. 13, p. 253. 



1918 Sex studies. XI. Hermaphrodite birds. Jour. Exp. Zool., vol. 



25, p. 1. 

 BouiN, p., et Ancel, p. 1903 Recherches sur les cellules interstitielles du 



testicle des mammiferes. Arch, de Zool., exp. et gen., nouv. ser., 



T. 1. 



1904 Recherches sur la structure et la signification de la glande inter- 

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1912 Recherches sur la spermatogenese des batraciens et les elements 

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1913 De I'existence d'un tissu glandaulaire endocrine temporaire dans 

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