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1. A small volume of artificial sea water containing 300 nM tetrodotoxin (TTX) was applied successively to seven lobster nerve trunks and the cumulative uptake of toxin investigated by bio-assay.

2. Light and electron microscopy indicated that the nerve trunks had a total axonal area of 0·7 x 10⁴ cm²/g.

3. Sodium analysis gave a sodium space for the nerve trunks of 30%.

4. The amount of toxin taken up by the cells in 1 g of nerve is less than 1·6 x 10^-11 moles.

5. It is argued that there are probably fewer than 13 sodium channels/µ² axon in lobster nerve.

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