EXPLANATION OF PLATE JN .—Continued. 



Figs. 4 and 5. — From the villi of a hedgehog, killed during absorption of 

 fat. The intestine was hardened with osmic acid. 



Fig. 4. — Oc. Ill ; Obj. 11 Immersion, x 850. Surface view of the 

 epithelium, teased and treated with caustic potash. 



The fat is seen as small black particles between the epithelial 

 cells. The clear spaces are the openings of the goblet cells. 



Fig. 5.— Camera lucida : Obj. 7, X 450. Oc. Ill; Obj. 8. Section of 



the lower part of a villus. 

 /. Chyle-vessel. 



In the upper part of the figure the fat-particles in the chyle- 

 vessel have run together. The fat-particles are seen in the 

 reticulum of the villus. 



Fig. 6.—Camera lucida: Obj. 5, x 300. Oc. Ill; Obj. 8. Section of 

 a short villus-like process : from the stomach of a dog, showing 

 the "epithelial buds." 

 The nuclei of the cells composing the bud-like groups are 



spherical, and are less stained than those of the neighbouring 



cells. 



Fig. 7.— Camera lucida: Obj. 5, x 300. Oc. Ill; Obj. 8. Surface 

 view of one of the terminal alveoli of the proper gland-tubes, 

 from the pyloric end of the stomach of a dog ; the animal was 

 killed two hours after meat food. 

 A delicate reticulum is seen surrounding the epithelial cells. 



Fig. 8.— Camera lucida : Obj. 5, x 300. Oc. Ill; Obj. 8. Oblique 

 section of one of the terminal alveoli of the proper gland- 

 tubes ; from the pyloric end of the stomach of a dog. The 

 animal was killed two hours after meat food. 



me. Membrana propria. 

 The nuclei and the reticulum are both clearly seen. 



Fig. 9.— Camera lucida: Obj. 5, x 300. Oc. Ill; Obj. 8. Section of 

 one of the terminal alveoli of the proper gland-tubes ; from the 

 pyloric end of the stomach of a dog. The stomach had been 

 hai'dened in osmic acid, and subsequently in chromic acid. 



The reticulum has a double outline, and is much broader than in 

 fig. 7. 



