BY C. J. MARTIN AND FRANK TIDSWELL. 499 



although June would indicate a somewhat early preparation for 

 pairing. We cannot, however, place much stress on this isolated 

 observation, as it is quite possible that the difference in develop- 

 ment was due to quite other causes. In the meantime the 

 biological significance of these extraordinary organs must remain 

 an open question. 



In conclusion we wish to express our thanks to our able assistan t 

 Mr. RoV)ert Grant for his help with the experiments. 



DESCRIPTION OF PLATES. 



Plate xxviii. 



Dissection of left femoral gland and duct (nat. size drawing). The leg is 

 strongly rotated outwards. The skin, panniculus carnosus, and deep fascia 

 have been reflected. The position and anatomical relations of the gland, 

 duct, and spur arc shown. 



a., M. gluteus max. ; b., M. erector spinas; <\, M. latissimus dorsi ; 

 d., M. iliacus ; e., M. gluteus min. ; /., M. gluteus med. ; g., M. rectus ; 

 h., AI. flex. long, halluc. ; i., M. tibialis post.; j., femoral gland ; 2, duct 

 (leaving gland) ; 2', duct (near base of spur) ; 3, spur. 



Plate XXIX. 



Transverse sections of gland ( x 10). 



Fig. 1. —Section of gland of animal killed June, 1894, showing dilated alveoli. 



Fig. 2. — Section of gland of animal killed April, 1892, showing fibrous 



condition. 

 Fig. 3. — Section of duct (showing two channels. 

 a., P]pithelium of duct. 



Plate XXX. 

 Transverse section of marginal portions of gland. 

 Fig. 1. — Section of gland of animal kdled June, 1894. 



a., Coarsely granular large alveolar cell (flat nuclei); b., fibrous tissue of 

 stroma ; c, fibrous tissue of capsule ; d., muscular layer of capsule. 



