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There are several methods by which the structure of a cell may be studied. The electron microscope makes it possible to visualize details of the ultra- structure, and to resolve these details with a resolution of 10 ~. Membranes may also be characterized in terms of the molecules which diffuse across them, leading to a resolution which may be an order of magnitude greater. It is the object of the present study to examine the giant nerve fiber of the squid by both of these methods to see if the combination will clarify the picture of the nerve membrane. The questions to be explored are: (1) are there any chan- nels in the Schwann cell which have not been previously detected? (2) where is the barrier to the diffusion of water into the axoplasm? (3) are the barriers to diffusion and filtration the same?and (4) can the axolemma be character- ized in terms of an equivalent pore radius? The final point of inquiry is whether the structure thus elucidated bears any relation to the ion transport mechanism which has already been so thoroughly explored (1).

Characterization of the Membranes in the Giant Nerve Fiber of the Squid