164 The Alligator and Its Allies 



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animal the glands here show their cell details far more 



clearly than in the former tissue; this may have 



been partly due to the latter sections being thinner. 



The glands are of a compound, tubulo-alveolar 



type ; although 

 e numerous sec- 



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: '?? - : " 3^ "^i,!^^^:? 7 -^^ tions through 



ducts were ob- 

 tained (as in 

 Fig. 39), no de- 

 tails of these 

 ducts could be 

 seen. 



As noted 

 above, and as 

 may be seen by 

 comparing Fig- 

 ures 37 and 39, 

 the gland during 

 hibernation, at 

 least in the an- 

 imals studied, consists of many more alveoli than 

 during the feeding season; this, of course, might 

 not prove to be always the case if larger num- 

 bers of animals were studied; the difference in 

 the ages of the animals might have caused 

 this difference in the glands. In the material 

 studied the largest glands from the hibernating 

 animals consist of more than twice as many alveoli 

 as the glands in the feeding animals. As seen 



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FIG. 39. One of the glands from the poste- 

 rior region of the tongue of the feeding animal, 

 under somewhat higher magnification than 

 used in Figure 37; av, alveolus; d, duct of 

 gland; e, stratified epithelium. 



