JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XV, 



Illustrating Dr. Herbert Watney^s paper on the Minute 

 Anatomy of the Alimentary Canal. 



The outlines of many of tlie preparations were drawn with an Ober- 

 haeuser's camera lucida ; in such cases the lens used with the camera lucida 

 and the approximate magnification are ^iven. The ocular and objective 

 which were used in completing the drawing are also given. 



The preparations from which these drawings are made were hardened in 

 chromic acid and alcohol, except where the contrary is expressly stated in 

 the following explanations. 



Fig. 1.— Oc. Ill; Obj. 8, x 400. Section of a villus from the small 

 intestine of a monkey. 



m. A band of involuntary muscle-fibres. The connective- 

 tissue reticulum surrounding the individual fibres is 

 attached to the membraua propria. 



ep. Epithelium. The epithelial cells are seen to be of diff'erent 

 lengths. 



r. Dark line at the base of the epithelial cells caused by the 

 reticulum. 



/. c. Lymph-corpuscle. 



e. Endothelial cells of the membrana. 



V. Blood-vessels. 



The great similarity of the cells of the villus to the cells com- 

 posing the membrana is seen. 



Fig. 2.— Camera lucida : Obj. 7, X 450. Oc. Ill ; Obj. 9. Vertical 

 section of the lower part of a villus from the small intestine of 

 a monkey, showing a large vein. 



me. Section of the membrana propria. 

 r. Reticulum. 

 The endothelial cells of the vein are seen to be surrounded by a 

 very delicate reticulum. 



Fig. 3.— Camera lucida: Obj. 7, X 450. Oc. Ill; Obj. 9. Section of 

 tiie lower part of a villus from the small intestine of a hedge- 

 hog. 



/. Central chyle-vessel, containing a little granular matter. 

 m. A small band of muscles ; they are in contiguity with the 

 wall of the chyle-vebsel. 

 The reticulum is attached to the wall of the chyle-vessel, and 

 passes between the cells of the villus. 



