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There ought to be small difficulty in demonstrating these structures to the satisfaction of the trained microscopist, who is accustomed to piece together fragmentary structures in full realization of the infrequency of ideally complete preparations; but those more engrossed in clinical medicine are less apt to obtain from our usually imperfect specimens a clear and coherent picture. The less direct method, therefore, of tracing the development of these specialized cells and their auxiliary apparatus from the primordial blastoderm, has the advantage of showing with greater ease and certainty the differentiation of these and adjacent cells of like origin; the building up of the complex structures of which they form a part and by a series of demonstrations, confessedly imperfect individually, it forms a sort of composite picture little short of the ideally complete.
Shortly after the formation of the cerebro-spinal axis by involution of the epiblast, a similar process at
RANDALL BA. THE HAIR-CELLS OF THE ACOUSTIC AND AMPULLAR AREAS OF THE EAR.. JAMA. 1898;XXX(7):363-365. doi:10.1001/jama.1898.72440590023001g