EVOLUTION OF IRONDEQUOIT VALLEY. 159 



data that the future with its greater undertakings may make more 

 abundantly available. 



Summary. 



The writer's aim has been to show ( 1 ) that the land forms of 

 this picturesque area, so close at hand and accessible for our city 

 schools and their teachers, are not fortuitous but explicable in every 

 detail and eloquent with the story of a marvellously entertaining 

 past, intelligible to all ; and (2) that the irregularities in the form of 

 the present Irondequoit valley are entirely a matter of the post- 

 glacial fillings and their subsequent erosion, in no case to be advanced 

 as an index of similar irregularities in the deeply buried rock valley 

 below. It must not be supposed that this paper exhausts the subject. 

 It is but the first raking of a field seeded by Gilbert and mowed by 

 Fairchild, from which much remains to be gleaned. Nor may it 

 close without an acknowledgment to the latter, the writer's godfather 

 in science and the regenerator of this society, to whom he owes a 

 measure of gratitude and appreciation not to be counted in words. 



