The object of this paper is to prove unfounded the prevailing assumption that ventral nerve roots cannot regenerate if avulsed from the spinal cord. That they do not regenerate in man is general clinical experience, certainly. Yet in exploring to their limits the regenerative capacities of various parts of the nervous system, one may find that clinical experience is a too conservative guide. One would like to know whether the failure to regenerate is primarily one of the nerve tissue or is secondarily due to obstacles interposed. If the latter, surgical intervention may be at least considered. If the former, the condition is perhaps still not irremediable, but the approach will be through other than surgical channels. The present report is concerned with demonstrating that in cats avulsion of ventral spinal roots is compatible with regenerative activity on the part of the neurons involved, even to the extent of functional