H. von Helmholtz, Treatise on Physiological Optics, transl. edited by J. P. C. Southall (Optical Society of America, 1924; Dover Publications, Inc., New York, 1964), Vol. 2, pp. 304–306.
W. A. Shurcliff, Polarized Light: Production and Use (Harvard University Press, Cambridge, Mass., 1962), p. 206.
H. H. Seliger and W. D. McElroy, Light: Physical and Biological Action (Academic Press Inc., New York, 1965), pp. 301–304.
W. A. Shurcliff and S. S. Ballard, Polarized Light (D. Van Nostrand Inc., Princeton, N. J., 1964), pp. 95–98.
W. A. Shurcliff, J. Opt. Soc. Am. 45, 399 (1955).
S. I. Vavilow, The Human Eye and the Sun, transl. O. M. Blumm (Pergamon Press, Ltd., Oxford, 1965), p. 89.
G. N. Ramachandran and S. Ramaseshan in Handbuch der Physik 25/1, S. Flügge, Ed. (Springer-Verlag, Berlin, 1961), p. 145.
M. Born and E. Wolf, Principles of Optics (Pergamon Press, Inc., New York, 1964), 2nd ed., p. 710.
Reference 8, p. 258.
Reference 8, pp. 705–708.
T. H. Waterman, Am. Scientist 54, 15 (1966).
Some authors11 claim to have observed dichroic pigment. Denton [E. J. Denton, Proc. Roy. Soc. (London) B150, 78 (1959)] has observed dichroic effects of the outer rod segments, but this dichroism can be attributed to the parallel-plate structure of the outer rod segments. This structure can be seen in electron micrographs.11 There is no need to invoke an instrinsic pigment property, and no dichroic pigment, as such, seems ever to have been detected.