Conditions that make it possible to obtain a good fixation of the frog retinal receptor cells in combination with a well preserved relationship between the receptors and the pigment epithelium are described. The red rod, the green rod, the single cone, and the double cone of the leopard frog were studied over their entire length by means of serial sectioning and their main features at low magnification were shown. The differences between the receptor types were demonstrated, and structural features allowing a positive identification at all levels in the receptor cell layer are pointed out. The receptor distribution in the posterior pole of the retina was as follows: 50% red rods, 15% green rods, 20% single cones, and 15% double cones. Interreceptor contacts, defined as direct relationship between cell surfaces without any interposition of Muller cell processes, were observed.