84 Embryology 



No. 225. WEED, LEWIS H. Development of the Cerebro-spinal Spaces. (Contri- 

 bution to Embryology, No. 14. Vol. V.) 116 pages, 17 plates. Pub- 

 lished 1917. Price $6.00. 



This represents the results of a study of the formation of the pathways for the 

 cerebro-spinal fluid in two mammalian embryos. Data regarding the stages in the 

 initial spread of this fluid were obtained by morphological studies and by a 

 physiological method of replacement of the existent fluid. Two functional areas 

 for the extraventricular passage of the embryonic ventricular fluid are described. 

 The process of differentiation of the perimedullary mesenchyme into the three 

 meninges of the adult is considered with regard especially for the circulation of 

 the cerebro-spinal fluid through the subarachnoid spaces. Throughout this paper, 

 the morphological changes in the development of the cerebro-spinal spaces have 

 been related as far as possible to the physiological use of these channels. 



No. 226. Contributions to Embryology, Nos. 15, 16, 17, 18, 19. Vol. VI. Quarto, 



168 pages. Published 1917. Price $7.00. 

 This book contains the following papers, not sold separately: 



MALL, FRANKLIN P. Cyclopia in the Human Embryo. (Contribution No. 15.) 



29 pages, 3 plates, 8 figs. 

 THURLOW, MADGE DEG. Quantitative Studies on Mitochondria in Nerve Cells. 



(Contribution No. 16.) 10 pages, i plate. 

 LEWIS, MARGARET REED. The Development of Connective Tissue Fibers in Tissue 



Culture of Chick Embryos. (Contribution No. 17.) 16 pages, 2 plates. 

 SABIN, FLORENCE R. Origin and Development of the Primitive Vessels of the 



Chick and of the Pig. (Contribution No. 18.) 64 pages, 7 plates, 8 figs. 

 JOHNSON, FRANKLIN PARADISE. A Human Embryo of Twenty-four pairs of Somites. 



(Contribution No. 19.) 42 pages, 8 plates, 9 figs. 



No. 227. Contributions to Embryology, Nos. 20, 21, 22, and 23. Vol. VII. Quarto, 



136 pages. Published 1918. Price $4.00. 

 This book contains the following papers, not sold separately: 



STREETER, GEORGE L. The Histogenesis and Growth of the Otic Capsule and its 

 Contained Periotic Tissue-spaces in the Human Embryo. (Contribution No. 20.) 

 50 pages, 4 text figs, and 4 plates. 



VAN DER STRICHT, O. The Genesis and Structure of the Membrana Tectoria and 

 the Crista Spiralis of the Cochlea. (Contribution No 21.) 32 pages, 4 plates. 



WHEELER, THEODORA. Study of a Human Spina Bifida Monster with Encephaloceles 

 and other Abnormalities. (Contribution No. 22.) 23 pages, 4 plates. 



INGALLS, N. W. A Human Embryo before the Appearance of the Myotome. (Con- 

 tribution No. 23.) 24 pages, 5 text figs, and 4 plates. 



No. 271. Contributions to Embryology, Nos. 24, 25, 26. Vol. VIII. Quarto, 

 198 pages. Published 1918. Price $5.50. 



This book contains the following papers, not sold separately: 



STREETER, GEORGE L. The Developmental Alterations in the Vascular System of the 

 Brain of the Human Embryo. (Contribution No. 24.) 38 pp., 5 pis., 12 text figs. 



COWDRY, E. V. The Mitochondrial Constituents of Protoplasm. (Contribution No. 

 25.) 120 pages, i plate, 9 figs. 



KUNITOMO, KANAE. The Development and Reduction of the Tail and the Caudal 

 End of the Spinal Cord. (Contribution No. 26.) 38 pages, 4 plates, 2 text figs. 



No. 272. Contributions to Embryology, Nos. 27 to 46. Vol. IX. Quarto. In press. 

 This book contains the following papers : 



MACKLIN, CHARLES C. The Development and Function of Macrophages in the Repair 

 of Experimental Bone-Wounds in Rats vitally stained with Trypan-Blue. (Con- 

 tribution No. 27.) 32 pages, 4 plates. 



DUESBERG, J. Cytoplasmic Structures in the Seminal Epithelium of the Opossum. 

 (Contribution No. 28.) 35 pages, 2 plates, 5 text figs. 



CORNER, GEORGE W. On the Widespread Occurrence of the Reticular Fibrils pro- 

 duced by Capillary Endothelium. (Contribution No. 29.) 8 pages, 2 plates. 



WHEELER, THEODORA. Variability in the Spinal Column as regards Defective 

 Neural Arches. (Rudimentary Spina Bifida.) (Contribution No. 30.) 12 pages, 

 ii figures. 



VAN DER STRICHT, O. The Arrangement and Structure of Sustentacular Cells and 

 Hair Cells in the Developing Organ of Corti. (Contribution No. 31.) 33 

 pages, 4 plates. 



RETZER, ROBERT. The Sino-ventricular Bundle. A Functional Interpretation of 

 Morphological Findings. (Contribution No. 32.) 13 pages, i plate. 



JENKINS, GEORGE B. A Study of the Superior Olive. (Contribution No. 33.) 15 

 pages, 2 pis., i text fig. 



SCHULTZ, ADOLPH H. The Development of the External Nose in Whites and 

 Negroes. (Contribution No. 34.) 17 pages, i plate, 7 figs. 



LEWIS, MARGARET REED. Muscular Contraction in Tissue Cultures. (Contribution 

 No. 35.) 25 pages, 2 plates, 6 text figs. 



