46 BULLETIN OF THE NATURAL HISTORV SOCIETY. 



to the prevention of drainage by the banks built up on 

 the canal and lake sides. T could not determine the 

 causes of the direction of the points and channel. 



As the points are still growing it is fair to conclude 

 that in time the delta will extend eorapletel}" across the 

 lake and divide it into two, a process which is known to 

 have occurred in lakes elsewhere by tlie growth of the 

 deltas of mountain torrents, but of which we have, I believe, 

 no example in l^ew Brunswick. 



Mr. S. W. Ivain has called the attention of the Society 

 to the great shallows at the outlet to Grand Lake, (Queens 

 County, suggesting that they were formed in a similar 

 way by sediment brought through the Jemseg. This is 

 no doubt correct, but the conditions are here rather less 

 remarkable, since Grand Lake, Jemseg and the St. John 

 are but slightly separated parts of one former lake basin, 

 while at Lake Utopia the river and lake are in separate 

 rocky basins. 



The points are not shown on the geological survey 

 map nor on the corrected surface geology map, but they 

 are plainly marked on the original survey map of 1796- 

 '97, upon which also the depths of the lake are given. 

 The thoroughfare near tlie lake is marked as seven feet 

 deep, at the extreme points as nine feet, while a quarter 

 of a mile further out it is only thirteen feet. But stil] 

 further out the depths are thirty-three, forty-two and fift}" 

 feet, showing clearly that the delta is being pushed out 

 into the lake. I could not myself, for lack of a boat,- 

 measure depths. Of course the delta is entirely post- 

 glacial, because the lake is formed l)y the glacial dam 

 between it and Letang. Possibly at one time the entire 

 Masrao-uadavic River Howed by this route to the sea. If 

 we could accurately measure the rate of growth of the 

 delta, we would, by measuring also its size, be in posses- 



