INTERSTITIAL CELLS OF THE CHICKEN TESTIS. I 53 



contrary, it appears that these differences in shape depend on 

 mechanical pressure conditions. The difference in the staining 

 capacity of the nuclei is not a basis for cell classification, for the 

 nuclei which take a deep stain include those of all shapes. The 

 fat in the testes is probably not formed by the interstitial tissue 

 at all, but is brought there by the circulation and deposited. So 

 we are brought to the conclusion that there are no "interstitial 

 cells" in the testis of the domestic chicken in the sense that this 

 term has been previously used. Furthermore no evidence has 

 been found in this study which would indicate that an internal 

 secretion of any kind is formed by any cells of the interstitial 

 tissue. This result would appear to derive interest and signifi- 

 cance in consideration of the fact that in few animals is there so 

 extensive a development of secondary sexual characters as in 

 the male of the domestic fowl. 







LITERATURE. 

 Ceni, C. 



'09 L'influenza del Cervello sulla sviluppo e sulla funzione degli organ! sessuali 



maschili. Riv. sper. di Freniatria. 35. 

 '09 L'influenza di alcune sostanze d'azione prevalentemente cerebrale sulla 



funzione dei testicoli (Caffe, Verona', e Absinthe). Riv. sper. di Freniatria., 



35- 

 Gudernatsch, J. F. 



'n Hermaphroditismus verus in Man. Am. Jour. Anat., n, p. 267. 

 Kirkbride, Mary B. 



'n Embryogenic disturbances of the testis. Arch. f. Entw. Org., 32, p. 717. 

 Loisel, G. 



'03 Elaborations graisseuses periodiques dans le testicule des oiseaux. Comp. 



Rend, de 1' Association des Anat., Sth Session, Liege, p. 222. 

 Mazzetti, L. 



'n I caratteri sessuali secondari e le cellule interstiziali del testicolo. Anat. 



Anz., 38, p. 361. 

 Poll, H. 



'06 Der Geschlechtsapparat der Mischlinge von Cairina moschata c? und Anas 



boschas 9 . Sitzber. der Ges. Nat. Fr., Nr. i, p. 4. 

 Poll, H., u. W. Tiefensee. 



'07 Mischlingstudien: die Histologie der Keimdriisen bei Mischlingen. Sitzber. 

 der Ges. Nat. Fr., Nr. 6, p. 157. 



