. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Portion of epithelium lining a small duct ^th of an inch in diameter. From a Rabbit. (Magnified 300 diameters.) There is every probability of the existence of a basement membrane here as in other sub-epithelial situations, and it is probably continuous with that which alone constitutes the walls of the ultimate ducts : for the fibrous and muscular elements gradually diminish as the ducts get finer, until in the smallest that are seen all fibrous appearance has vanished, and a homogeneous membrane alone remains. According
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Portion of epithelium lining a small duct ^th of an inch in diameter. From a Rabbit. (Magnified 300 diameters.) There is every probability of the existence of a basement membrane here as in other sub-epithelial situations, and it is probably continuous with that which alone constitutes the walls of the ultimate ducts : for the fibrous and muscular elements gradually diminish as the ducts get finer, until in the smallest that are seen all fibrous appearance has vanished, and a homogeneous membrane alone remains. According to Henle the homogeneous wall of the smallest ducts consists of fibres fused and run together in a plane; — a supposition that would imply the non-existence of this mem- brane in the larger ducts, where they are not so fused. Capillaries. — The arrangement of the ca- pillaries remarkably resembles that of fat. They form a close and pretty even-meshed net work, open on all sides, among the meshes of which the follicles lie, just as the vesicles do in the case of fat; so that the closeness of the plexus is a measure of the size of the follicles. Their general appearance is well seen in the accompanying figure (Jig. 6-t.). Fig. Arrangement of the capillaries of the pancreas. Frnm a minute lobule of the pancreas of a young Rabbit. (Magnified 80 diameters.) III. COMPARATIVE ANATOMY. Invertebrata, — Certain organs connected with the alimentary canal have in some of the higher invertebrata received the name of pan- creas ; but they have done so rather from their position and interred function than from any certain evidence of their use, or from their anatomical structure. In Gasteropoda we find the first indications of the organ, and it presents in them the form of a single, long, blind, glandular sac, communicating with the' beginning of the intestine ; such a pancreas may be seen in the different species of Aplysia and Doris, Tritonia and Scyllasa. Cephalopoda.—The Te
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