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Watson, John B. 36. 03. Animal education: an experimental study on the psychical development of the white rat, correlated with the growth of its nervous system. The University of Chicago Press, Chicago, 1903. Westphal. 37. '70. Ueber künstlich erzeugte secundäre Degeneration einzelner Rückenmarksstränge. Arch. f. Psychiatrie u. Nervenkrankheiten, II, 415. Worcester, W. L. 38. '98. Regeneration of nerve fibers in the central nervous system. J. of Exp. Med., III, 579. Ziegler, E. 39. '95. Lehrbuch der patholog. Anat., Theil II, S. 354. EXPLANATION OF FIGURES. PLATE VII. Figs. 1-4. Photo-micrographs of frontal sections of the left cerebral hemispheres of rats, showing the position of the scar and the general appearance of the surrounding parts. Sections 45μ stained by the PAL-WEIGERT technique. The cut is indicated by "". The scar is seen as a light band, medial to which the fibers are numerous, and lateral to which they are less abundant. Fig. 1. 53 days later. Fig. 2. From Rat No. 2, operated on when 7 days old and killed 42 days later. Showing aggregation of fibers in the scar in the ventral part of the cortex just above the sharp notch on the ventral surface. Notice that the scar has been distorted by the shifting of the areas of the cortex with reference to each other. From Rat No. 1, operated on when twenty-one days old and killed Fig. 3. From Rat No. 3, operated on when 3 days old and killed 41 days later. Notice the complete disappearance of the corpus callosum lateral to the injury. Fig. 4. From Rat No. 4, operated on when 0.5 day old and killed 40 days later. Notice the degeneration of the corpus callosum on both sides of the lesion. Fig. 5. Camera lucida tracing of the fibers in and about a small area of the scar (Rat No. 1) seen in Fig. 1, taken at a point about one-third of the way from the corpus callosum to the surface of the cortex. The arrow indicates the path of the knife, and "f" a fiber crossing the scar. Fig. 6. Camera lucida tracing of the fibers in and about a small area of the scar (in Rat No. 3) seen in Fig. 3, taken at a point about one-third of the way from the corpus callosum to the surface of the cortex. The arrow and "¿" have the same significance as in the preceding figure. The fibers in the scar are slightly more abundant than in Fig. 5. Fig. 7. Drawing of the area of scar tissue (Rat No. 4) seen in Fig. 4, made on a small scale because the scar was too wide to be included with the surrounding tissue in a high power tracing. The alveus (a) is normal. The corpus callosum (c.c.) is unstained, with the exception of a few fibers. The arrow indicates the path of the knife and "f" designates a fiber apparently crossing the scar. Fig. 8. Camera lucida tracing of a small area of scar in another section. from the same brain (Rat No. 4) as that represented In Fig. 4. Fig. 9. Drawing of the aggregation of fibers in the scar in the ventral part of the cortex (Rat No. 2) shown in Fig. 2. Notice the masses of blood pigment (6) along the line of the wound indicated by the arrow. Many fibers run downward along the scar, some of which cross the line of the incision at "f". Fig. 10. Drawing from a frontal section of the left cerebral hemisphere of a rat operated on at the age of 4 days and killed 32 days later. The cortex was fixed in VAN GEHUCHTEN's solution, imbedded in paraffin, cut in sections 6μ thick, and stained in erythrosin and toluidin blue. The path of the knife is indicated by "c". Notice the absence of connective tissue cells, and the presence of nerve cells bordering directly on the line of the incision. ON THE DENSITY OF THE CUTANEOUS INNER I. II. VATION IN MAN. By CHARLES E. INGBERT. (From the Neurological Laboratory of the University of Chicago.) INTRODUCTION. THE RELATION OF THE CUTANEOUS AND THE MUSCULAR NERVE Estimate Based on Stilling's Results. III. 1. DETERMINATION OF THE AREA OF THE DERMAL SURFACE OF THE IV. THE INNERVATION OF THE DERMAL SURFACE OF THE HUMAN BODY. V. THE BEARING OF THE AUTHOR'S ESTIMATE OF THE INNERVATION OF THE DERMAL SURFACE ON THE THEORY OF THE SPECIFIC ENERGIES OF NERVES. It was, at first, the author's intention to publish this discussion as a part of his more extended paper on the "Enumeration of the Medullated Nerve Fibers in the Dorsal Roots of the Spinal Nerves of Man." This, however, was found im |