terosseous of the median had communications with the posterior interosseous of the musculo-spiral. Supposing that such paths were present, might not their existence have guided an unusual number of regenerating fibers to the extensors under the stress of needed additional supply, since the usual source (the musculo-spiral) was defective? Dr. C. M. Miller, professor of anatomy in the-Medici I College of Virginia, agrees fully with Dr. Piersol in this solution of the case.