Abstract
The connectivity of saccules of vertebrate outer segments to the extracellular compartment was explored. When glutaraldehyde fixed, detached retinas of monkeys, pigeons, rats and mice were exposed to lanthanum colloid, saccules within cones of monkeys and pigeons were penetrated and also some within very rare, possible cones of rats and mice. No rod saccules infiltrated. When detached retinas of rats and frogs and attached retinas of rabbits were exposed to 1 per cent ferritn suspensions, prior to fixation, the subsequently fixed material only revealed ferritin in the saccules of frog cones. The limitations of the tests and their significance are discussed.
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