232 CKUISE OF THE NEPTUNE 



From a study of the different sets of glacial striae, Tyrrell 

 concluded that the centre of glaciation was, in the early part of 

 the glacial period, somewhere to the north and west of the head 

 of Chesterfield inlet ; that later, when the ice increased in thick- 

 ness, the centre of dispersion moved to a position southwest of 

 Baker lake; while as the glacier diminished the centre moved 

 nearer the seashore, and the final stage was probably repre- 

 sented by the ice-cap breaking up into a number of distinct 

 glaciers, each with local movement of its own. 



These conclusions of Tyrrell as to the southern movement of 

 the centre of glaciation are borne out by the writer's observa- 

 tions of the striae along the shores of Roes Welcome, where as 

 many as six sets of striae were found at Whale point, the usual 

 number being three. The oldest set, found only at Whale point, 

 showed that the ice movement was from the northwest. The 

 next in age were from IT. 50 E., or almost at right angles to 

 the oldest; following in order of age come striae from IT. 25 

 E., K, IT. 30 W., and IT.W. The last three sets are found in 

 a number of places between Winchester inlet and Whale point ; 

 the others only at Whale point. The direction of the above sets 

 of striae apparently shows that the earliest accumulation of ice 

 in the region north of the western side of Hudson bay was some- 

 where to the northwest ; this was followed by an abrupt change 

 in the ice-movement, which was next from almost northeast, 

 after which the centre of movement of the ice-cap gradually 

 shifted, by way of north, to northwest. It would also appear 

 that the centres of dispersion were much greater in area than 

 the limits placed upon them by Tyrrell. 



This southern movement of the centre of dispersion of the 

 ice is diametrically opposite to what occurred in the case of the 

 ice-cap of Labrador, where the striae along the east side of Hud- 

 son bay show that the centre of ice-movement changed from a 

 position near the central area of the peninsula, a short distance 



