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As to the second statement, the remark may be made that the whole follicular structure furnished with columnar epithelium is an absorbing and not an eliminating apparatus, and that, since its functional activity is from the beginning of the disease diminished by an inadequate blood-supply, it can have but a small and indirect share in generating the phenomena of the disease.

The medullary part consists of small islets of cells, which resemble columnar epithelium lying among venous sinuses; these cells are said to be in close connexion with the sympathetic nerve filaments from the great solar plexus.

It is lined with ciliated columnar epithelium.

The part of the tract near the tongue is lined by squamous epithelium; the lower part by columnar epithelium, which, below the level of the hyoid, is usually ciliated.

Figure 4L, through the region of the hindgut, shows at i the completely inclosed intestine; it is a comparatively narrow tube, lined 6 with columnar epithelium outside of which is a dense layer of mesoblast continuous with the mesentery.