140 THE FROG chap, vin 



with goblet cells amongst them ; and a deeper connective-tissue laver, 

 the siibinticosa, enclosing blood-vessels, nerves, and lymphatics. 



b. Miisailar layer : an external longitudinal, and an internal circular 

 laj'er r)f unslriped muscular fdires. 



f. rerilotical layer. This is xer)- Ihin, and a carchd examination 

 of good preparations is required in order to make out its structure 



(P- 131)- 

 Sketch. 



3- Transverse section of stomach (Fig. 40).— After recognising 



the layers as above, note : — 



a. The gastric glands^ and h. The nuiscttlaris vnicoser. 

 Sketch. 



4- Sections of liver (Fig. 41). 



a. Polyhedral glajul-celh ; /'. Bile passages and ducts ; t . Blood eapil- 

 taries and vessels. 

 Sketch. 



5- Sections of pancreas (Fig. 42). 



a. Loludes, each consisting o{ gland-celh ; b. Ducts. 

 Sketch. 



