Two types of horizontal cells, H1 and H2, were classified using the Golgi technique on flat mounts of the retina of the frog. Cell type H l possesses rather short, thick dendrites; the diameter of its dendritic field ranges from 40–90 μm. H2-cell displays long and thin dendrites; the diameter of its dendritic field is 70–160 μm. H1-cells possess an axon running horizontally within the outer plexiform layer. The axon terminals are slight swellings emitting fine processes that end in the outer plexiform layer. H2-cells do not have a discernible
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