IN THE NORTH AMERICAN LAKES. 25 



once. Lowest water occvirred under a westerly breeze, four times; and Avith 

 southerly (or off shore) winds, ten timc-s; nortlierly, four; and in cahn weather, 

 twice. 



At Cleveland, therefore, northeast winds pile up the waters more than any other. 

 At Buffalo southwest, and at Oswego the west winds produce the same effect. 



REGULARITY OF THE RISE AND FALL. 



To show more perfectly the reg-ular progress of tlie changes of level within the 

 year, I have divided the observations for a few months into weeks, and constructed 

 curves accordingly. For Buffalo I have selected two months in a rising stage of 

 water, and for Cleveland five months in a falling stage. With these remarks the 

 diagram Avill be understood. (Plate II, number 4.) 



