It has been reported (Barnard, '38), on the basis of shorttime experiments, that section of the ventral roots of spinal nerves resulted in a disappearance of end-bulbs (boutons terminaux, end-f eet, central nerve endings) from the corresponding ventral horn cells. I n a later paper ('40) the same author has given a more detailed description of her methods and results. While such a trans-synaptic effect was unex-'The work reported in this paper waa done under the direction of Dr. A. T. Rasmussen and was submitted to the graduate faculty as a portion of a thesis in partial fulfillment of the requirements for the degree of master of science. Dr. Edith Boyd, Department of Anatomy, University of Minnesota, supervised the quantitative work. 239
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