PHILOSOPHICAL SOCIETY OF WASHINGTON. 69 



Mr. G. K. Gilbert made further remarks on 



HORARY oscillations OP THE ATMOSPHERE, 



concluding that the increase of temperature from 5 A. M. to 3 

 P. M. was insufficient to account for the higher barometer in 

 that period. 



Mr. J. J. Woodward made a communication on 



THE MARKINGS ON NAVICULA RHOMBOIDES, 



illustrating by photographs magnified on a screen, and showing 

 how the real markings could be distinguished from the interference 

 lines produced by oblique illumination of the object. 



Mr. W. Harkness continued his description of places visited 

 while on the Southern Expedition for observing the late transit 

 of Venus, viz., Crozet's Island and the Sandwich Islands. 



103d Meeting. March 25, 18Y6. 



The President in the Chair. 

 Thirty-five members and visitors present. 

 Mr. G. K. Gilbert made a communication on 



LANDSLIPS AND LAKELETS, 



enumerating the various modes in which lakes originate, and 

 describing in particular a class which occur on the slopes below 

 certain high cliffs and depend on the manner in which the hard 

 capping rock, usually volcanic, is undermined and parts in large 

 blocks. 



Mr. Powell spoke of similar lakes, but in which the upper 

 stratum was conglomerate instead of volcanic. There were lakes 

 on the north side of the Uintah Mountains formed in the beds 

 of old streams by dams of detritus. 



Dr. David Murray, Foreign Superintendent of Educational 

 affairs in Japan, gave the Society an account of 



THE PROGRESS WHICH HAD BEEN MADE IN EDUCATIONAL MATTERS 

 IN THAT EMPIRE. 



