L. G. YATES — PECULIAR GEOLOGIC PROCESSES. 133 



The following papers were read by title : 



ON THE SEPARATION AND STUDY OF THE HEAVY ACCESSORIES OF ROCKS. 



BY OKVII.LE A. DERBY. 



This paper is published in full in the Proceedings of the Rochester 

 Academy of Science, volume I, 1891, pp. 198-206. 



PECULIAR GEOLOGIC PROCESSES ON THE CHANNEL ISLANDS OF CALIFORNIA. 



BY LORENZO G. FATES. 



(Abstract.) 



The eastward trend of the California coast south of Point Conception causes the 

 summer trade-winds to assume the same direction parallel to the coast. Since the 

 islands of the Santa Barbara channel have been largely denuded of their herba- 

 ceous vegetation by slice}) and cattle, the shore sands drift heavily to leeward, even 

 as far as from San Miguel, the outermost island, across a four-mile channel to Santa 

 Rosa. This sand ill Is the cavities left by decaying vegetation, and casts of trunks 

 of trees and shrubs are thus formed, which in the course of time consolidate, and 

 may hereafter puzzle the geologist. 



THE PRINCIPAL MISSISSIPPI SECTION. 



BY C. E. KEYES. 



PROCEEDINGS OF THE SECOND SECTION. 



The papers on glacial geology and the Pleistocene formations were 

 read in the Second Section, which met in room 14 of Columbian Univer- 

 sity, Vice-President T. C. Chamberlin presiding, and Professor Samuel 

 ( ;il \ in acting as Secretarv. 



Vice-President Chamberlin called Professor X. H. Winched to the 



chair and read a paper entitled : 



THE PRESENT STANDING OF THE SEVERAL HYPOTHESES OF THE CAUSE OF 



THE GLACIAL PERIOD. 



BY T. C. CHAMBERLIN. 



This paper was discussed at length by C. II. Hitchcock, X. S. Shaler, 

 Warren Qpham, E. \V. Claypole, K. D. Salisbury , J. A. Holmes, and the 

 author. 



