522 DR. J. W. GREGORY ON THE [jS OV. I 894, 



Fig. 4. — Terminal Moraines of the Lewis Glacier. (Diagrammatic.) 



small one, and the close proximity of the different memhers of this 

 series suggests that the glacier has been for some time almost 

 stationary, but subjected to numerous slight oscillations. These 

 may result from irregular annual variations in the snowfall, but it 

 is not improbable that they may have been produced by the well- 

 known oscillation of the ice-periods l which results from the period- 

 ical oscillation iu the temperature of the globe. 



IV. The Causes of the Glaciation. 



The main geological interest of the former extension of the 

 Kenyan glaciers, at a period geologically recent, is the fact that the 



1 M. Rykatschew, ' Ueber den Auf- unci Zugang tier Gewasser des russischen 

 Reiches,' ll' er Suppl. Bd. zum Repert. f. Meteor. St. Petersburg, 1887, p. 53. 



Ed. Bruckner, ' Klimaschwankungeii seit 1700, nebst Bemerkungen iiber die 

 Elimaschwankungeii der Diluvialzeit,' Geogr. Abh. vol. iv. Heft 2 (1890), 

 pp. 244-255. 



