. The Journal of comparative neurology and psychology. ces methat there is only an interlacing together with a certain crowding, ascompared with foetus, and that the mesencephalic fibersall join the sensory root. From the horizontal sections next to bedescribed this interlacing is drawn as accurately as possible underthe camera without any schematizing, and the evidence for the con-clusion here stated will be seen in those figures. It should be bornein mind, however, that in both the series of transverse sections abovedescribed the greater part of the mesencephalic root clearly pas
. The Journal of comparative neurology and psychology. ces methat there is only an interlacing together with a certain crowding, ascompared with foetus, and that the mesencephalic fibersall join the sensory root. From the horizontal sections next to bedescribed this interlacing is drawn as accurately as possible underthe camera without any schematizing, and the evidence for the con-clusion here stated will be seen in those figures. It should be bornein mind, however, that in both the series of transverse sections abovedescribed the greater part of the mesencephalic root clearly passesdown to the sensory root wholly separate from the motor root, so thatany doubt that might exist regarding its possible relation to themotor root would attach to only the small part of its fibers. The cells of the mesencephalic root are drawn in black in Figs. 21and 22. It is clearly seen here that these cells are separated fromthe motor nucleus liv the motor root bundles and bv the arcuate 628 Journal of Comparative Neurology and Psychology. tei/i. Fig. 23. Human foetus, 37 cm., frontal section througli the inferior coUiculusand isthmus. X 20. Description in the text. Johnston, The Radix Mesencephalica Trigemini. 629 fibers of the acustic area. In these figures the cells are removed fromthe motor nucleus by about the diameter of that nucleus itself. Thecells shown in Fig. 22 are the nearest cells to the motor nucleus. Foetus of 37 cm., horizontal or frontal sections. From this seriesnine sections are drawn (Figs, 23 to 32) showing the course of themesencephalic root from the mid-brain to its exit in the the purpose of demonstrating whether this bundle is connectedwith the motor or sensory root it will be best to follow it from abovedoAvnward in the description. In sections through the decussation
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