Effects ot tbe Glacial ipcrfo^ 233 



Niagara Falls, a distance of about seven miles. 

 A vast amount of interest centers about this 

 river because it is the best evidence we have 

 of the time that has expired since the glacial 

 period. A great deal of study has been given 

 to determine the amount of erosion at the Falls 

 during a year's time. If this could be accu- 

 rately determined, then by measuring the dis- 

 tance from the present falls to Queenstown, 

 we could easily determine the number of years 

 since the ice period. It is difficult to deter- 

 mine, for the conditions may have changed; 

 for instance, the rock at the Falls to-day is 

 said to be harder than it is further down to- 

 ward Queenstown. The estimates vary from 

 35,000 years to 10,000 years that is, from a 

 rate of erosion of five feet to one foot, per year. 

 Every science is, nearly or remotely, related 

 to every other science. If we could determine 

 ac urately the date of the ice period it would 

 se tie a whole lot of other questions that are 

 re ated to it, and one of them is the antiquity 

 o: man. Many stone implements such as were 

 n.ade and used by the aborigines have been 

 found at various times buried deeply under 

 tne glacial drift. These finds have occurred 



o often that there no longer remains a doubt 

 but that a race of men existed on this conti- 



lent in preglacial times. There are evidences 

 that at a time long ago the temperate zone ex- 

 tended far north of this, and it is not impos- 



