Literary Notices. 433 



it is proposed to substitute the terms hypencephalic area (including 

 the hypothalamus, etc.) and epencephalic area (cerebral and cerebellar 

 hemispheres, thalamus, corpora quadrigemina, brachium conjunctivum, 

 olive and part of the pontile nuclei). 



His combats vigorously (p. 29, ff.) the idea of the origin of con- 

 duction paths from a primitive nervous syncytium as expressed by 

 Bethe in his recent book. 



Summarizing the development of the brain in the first month, we 

 find that the regional differentiation of the medullary tube is begun, but 

 not far advanced. There is formed a separate mantle layer containing 

 neuroblasts whose neurites form motor root fibers, arcuate fibers and 

 in the ventral zones longitudinal funicles directed caudad into the 

 spinal cord. 



The chapter on the development of the cerebral hemispheres com- 

 prises 96 pages. The earlier contributions on the form relations are 

 reviewed and thoroughly worked over. The histogenesis of the cere- 

 bral cortex as it occurs during the third and fourth months is given in 

 detail, followed by the development of the blood vessels and commis- 

 sures. Finally, 75 pages are devoted to^^he sequence of development 

 of the intra-medullary fiber pathways. c. j. h. 



Wilder, Burt G. The Brain of the Sheep. Physiology Practicums, Part IV, 

 pp. 49-76. Published by the Author, 1904. 



A copy of the latest revision of Dr. Burt G. Wilder's Practi- 

 cum devoted to "The Brain of the Sheep," indicates that this 

 veteran neurologist is still employing the familiar methods which have 

 served so good a purpose in his hands. The revision chiefly concerns 

 details and the author cannot refuse a plaintive yet hopeful protest 

 against a "reactionary tendency" as regards nomenclature in America. 



c L. H. 



Harrison, Ross Granville. Experimentelle Untersuchungen iiber die En- 

 twicklung der Sinnesorgane der Seitenlinie bei den Amphibien. Archiv 

 f. mik. Anat., Bd. LXIII, H. i, pp. 35-149, T903. 



The results of numerous cuttiug and grafting experiments per- 

 formed upon frog embryos at the time of the growth of the lateral lines 

 show that the lateral line Anlage follows definite paths formed by the 

 surrounding tissues, that its growth is determined by forces within itself 

 and not from stimuli received from surrounding tissues, and that the 

 differentiation of the Anlage into the sensory and supporting cells of the 

 sense organs is likewise free from the influence of the surroundings ex- 

 cept that adequate space is necessary for the development of typical 

 organs. J. b. j. 



