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DR. HERBERT WATNEY ON THE MINUTE 
l. Central chyle-vessel. 
v. Blood-vessels. 
Fig. 15. Camera Lucida : obj. 8, x600 — oc. hi., obj. 9. 
Artery, from a vertical section of a villus from the small intestine of a 
hedgehog. 
The reticulum is seen as a dark line surrounding the individual muscle-fibres. 
c. Cells of the villus. 
Fig. 16. Camera Lucida: obj. 8, x600 — oc. hi., obj. 9. 
Artery, from a vertical section of a villus from the small intestine of a 
hedgehog. 
The muscle-fibres surrounding the vessel only occur at rare intervals. 
The reticulum (r) is seen as a dark line surrounding the individual fibres, and, 
where these muscle-fibres are wanting, the reticulum forms an adventitia to 
the vessel. 
The elongated nuclei of the endothelial cells are seen. 
Fig. 17. Camera Lucida : obj. 8, x600 — oc. hi., obj. 9. 
Vessel, probably an artery, from a section of a villus of the duodenum 
of a rat. 
The reticulum forms an adventitia to the vessel. 
Fig. 18. Camera Lucida: obj. 8, x600 — oc. hi., obj. 9. 
Vein, from a section of a villus of the duodenum of a rabbit. The reticulum 
forms an adventitia to the vessel, and passes between the cells of the villus. 
Fig. 19. Camera Lucida: obj. 7, x450 — oc. hi., 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. 
v. Capillary blood-vessel. 
r. Beticulum. 
The endothelial cells of the vein are seen to be surrounded by a very deli- 
cate reticulum. 
There is great similarity between the cells of the villus and the endothelium 
of the vein. 
Fig. 20. Camera Lucida: obj. 5, X 300 — oc. hi., obj. 8. 
Section of a narrow villus, from the duodenum of a rat. 
ep. Surface of the epithelium. 
v. Capillary blood-vessels. 
A reticulum is seen between the endothelial cells of the chyle-vessel (l). 
Fig. 21. Camera Lucida: obj. 7, x450 — oc. hi., obj. 9. 
Section of a villus, from the commencement of the duodenum of a dog. 
1. The central chyle-vessel. 
m. Bands of involuntary muscle-fibres. 
