The internal secretions and the principles of medicine . ed and suppliedwith a special nerve and ganglion. This is Spengels olfactoryorgan, which tests the respiralnri/ fluid, and is persistent in its 1 Editorial: Medical News, Dec. 24, 1904. Ray Lankester: Art. Mollusca, Encyclo. Britanniea, ninth edition,vol. xvi, p. 636. (960) THE PITUITARY AS CENTER OF IMMUNIZING FUNCTIONS. 961 position and nerve-supply throughout the group tliis group of cells Lankester gave the name and HaswelP more specifically define the functions ofthis organ, viz., to test the purily of
The internal secretions and the principles of medicine . ed and suppliedwith a special nerve and ganglion. This is Spengels olfactoryorgan, which tests the respiralnri/ fluid, and is persistent in its 1 Editorial: Medical News, Dec. 24, 1904. Ray Lankester: Art. Mollusca, Encyclo. Britanniea, ninth edition,vol. xvi, p. 636. (960) THE PITUITARY AS CENTER OF IMMUNIZING FUNCTIONS. 961 position and nerve-supply throughout the group tliis group of cells Lankester gave the name and HaswelP more specifically define the functions ofthis organ, viz., to test the purily of the water entering bythe respiratory current, Ascending from the Invertebrates to the Vertebrates, wefind this same organ in the lowest of fishes, the laneelet oramphioxus. In this lowly animal, the water, which enters themouth and traverses the entire body, also subserves the re-spiratory function (Lankester).* The mouth of Amphioxuswould seem to be well guarded against the intrusion of noxioussubstances, writes Willey,-^ everything entering the mouth. ^.s eiid Fig. 1.—Test-Organ in Amphioxus in a Young Transparent Individual.(After J. MiiUcr, slightly modified by Willey). tco. Ciliated epitheUal tracts, (js. Gill-slits, cud, Endostyle (the future thy-roid), va, Down-growth of Aorta, nt, Spinal cord, ch, , Eye-spot, vi, Cirri. has to pass through a vestibule richly provided with sensitiveepithelial cells. The relations of these cells are shown in Lloyd Andriezen* likewise refers to sensoi-y structures inamphioxus constituting a nervous organ, which is sensitiveto the quality of the water which passes over it, and remarksthat this is no isolated phenomenon, for we find a strikinganalogy in the osphradial organ and ganglion of Mollusca,which is situated at the entry of the mantle or respiratorychamber, and serves to test the quality of the water whichpasses over the respiratory organ. We thus have clear cvi- 3 Parker and Haswell: Manual of Zoology, p. 277, If
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