626 PROCEEDINGS OF THE KEW YORK MEETING 



The hypothesis of Arrheuins and Chamberlin would therefore appear to find 

 circumstantial support iu the occurrence of glaciation at the time of the post- 

 Penusylvanian uplift. If the efficiency of CO, as a climatic factor be admitted, 

 not only may the occurrence of refrigeration itself he explained, b\it perhaps 

 the singular geographical distribution of the ice action as well. The latter 

 would appear to liave been the result of complicated influences, very important 

 among which would be the great exaggeration of temperature differences at- 

 tending differences in altitude in the atmospheric column were there a deple- 

 tion of the CO2 of that column. The temperature gradient would be very 

 much steepened and the frost line brought down nearer to sealevel. To this 

 fact, which does not appear to have received due consideration at the hands 

 of geologists,- in connection with the probable great size and considerable 

 height of the older Gondwana land masses, as shown by the great thickness 

 of coarse sediments and the great size of the continental basins, is, in the 

 writer's opinion, chiefly diie the extension of the Permian glaciation within 

 the tropics. 



The next paper was 



COAL MEASURES Aj^D HIGHER BEDS OF SOUTH BRAZIL 

 BY I. C. WHITE 



The next paper was read by title : 



NORMAL PRESSURE FAULTlNa IN THE ALLEGHENY PLATEAUS 



BY GEO. 11. ASHLEY' 



1 



The following two papers were read without intermission : 



CONDITIONS OF CIRCULATION AT THE SEA MILLS OF CEPHALONIA 



BY M. L. FULLER 



This paper has been printed as pages 221-232 of this volume. 

 Mr Fuller's paper was discussed by J. F. Kemp and "W. M. Davis. 



CONTROLLING FACTORS OF ARTESIAN FLOWS 

 BY MYRON L. FULLER 



[AT>stract]* 



Contents 



Pape 



Introduction 627 



Underground water reservoirs 627 



Types of water reservoirs 627 



Sources of underground water 629 



Confining agents 629 



Nature of artesian circulation 6.30 



Factors in artesian circulation 630 



* Ttie full paper is in press as a bulletin of the United States Geological Survey. 



J 



