612 ANIMAL PHYSIOLOGY. 
made physiologists cautious in adopting so mechanical an expla- 
nation. If all our perceptions of color, however minute the 
Wie. 452.—Diagrammatic Tepe onianen of ductus cochlearis and organs of Corti (after Lan- 
dois). N, nerve of cochlea; K, inner, and P, outer, hair-cells; n, nerve-fibrils termi- 
nating in P; a,a, pogo ed cells ; d, cells of succus spiralis; z, inner rod of Corti; y, 
outer rod of Corti; , Membrane of Corti (membrana tectoria) ; 0, membrana reticu- 
laris ; H, G, cells of area toward outer wall. 
shade of difference from others (and some believe we can recog- 
nize millions of such gradations), are the result of the fusion, 
Fie. 453. 
Fig. 453.—Auditory epithelium from macula acoustica of saccule of alligator, much magni- 
fied (after Schafer). c,c, columnar hair-cells; f, f, fiber-cells ; n, nerve-fiber losing its 
medullary sheath and about to terminate in columnar auditory cells: h, auditory hair ; 
h’, base of auditory hairs split up into fibrils. ‘ : 
Fic. 454.—Diagrammatic a ig a of distribution of auditory nerve in membranous 
labyrinth and cochlea (after Huxley). 
