RECORDS OF MEETINGS 379 



shale is believed to be of Devonic age, while farther south it is Missis- 

 sippic. 



Dr. Clarke briefly indicated a number of points on which he disagreed 

 with the author's conclusions. The paper was further discussed by Mr. 

 F. W. James. 



The Section then adjourned. D. W. Johnson, 



Secretary pro tern. 



SECTION OF BIOLOGY 



11 May, 1914 



Section met at 8:15 p. m.. Professor Eaymond C. Osburn presiding. 

 The minutes of the last meeting of the Section were read and approved. 

 The following programme Avas then offered : 



H. von W. Schulte, Eakly Stages in the Development of the 



Brain in the Domestic Cat. 

 Frederick Tilney, The ^foKPiroLooY of the Floor of the Third 



Ventricle in Craniates. 

 0. S. Strong, The Theory of Nerve Components. 



Summary of Papers 



Professor Schulte discussed the very early and hitlierto little known 

 stages in the development of the brain in the domestic cat in their bear- 

 ing on the problem of the primary encephalic segments of the mammalian 

 brain. This paper has been published as pages 319-346 of this volume. 



Dr. Tilney, by means of a series of cross-sections and reconstructions 

 of the region of the hypophysis in typical vertebrates, endeavored to trace 

 the homologies of the diversely modified parts throughout the vertebrate 

 series. (Partly published in "Internat. Mouatsschrift fiir Anat. und 

 Physiol." Bd. XXX, 1913.) 



Dr. Strong traced the history of his subject especially in relation to 

 the work of the "American school" of neurologists. He discussed the 

 morphological classification of nerves and nerve components, spoke of 

 the technique of tracing nerve components in complex bundles and out- 

 lined the broader conclusions relating to the several homologies of the 

 cranial nerves in fishes on the one hand and in terrestrial vertebrates on 

 the other. 



After remarks by Professor Huntington and others the Section ad- 

 journed. 



William K. Gregory. 



Secretary. 



