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The Finnish scientist, Gunnar Svaetichin, described a "cone-actionpotential" in the retina of fish in 1953. Since then, this potential has been adduced to the horizontal cells of many species. The term "S-potential" has been coined honoring its discoverer. Students and friends, many of them from Svaetichin's years in Venezuela, dedicated contributions to their mentor's memory. The book contains relevant recent research on the structure, function, biochemistry, and pharmacology of horizontal cells in vertebrate subprimate animals. The text is well written, illustrated, and referenced. Of historical interest is the last chapter that sets Svaetichin's work into perspective. Originally it caused considerable controversy, since it challenged the accepted electrophysiological theory of the day. The text is for a reader prepared for an in-depth analysis of horizontal cells.