676 Prof. G. Chrystal on Seiches. [May 17, 



After this wave reached St. Fillans, the hmnogram shows that it 

 was reflected backwards and forwards between the ends of the lake, 

 at first with a good deal of irregularity. But gradually it developed 

 the characteristics of a regular seiche ; and finally settled down into 

 a moderately strong dicrote seiche, in which the uninodal component 

 predominated. This seiche attained its full development about three 

 and a half hours after the squall : and it is a very remarkable fact, 

 that its range considerably exceeds the first maximum elevation 

 recorded immediately after the passage of the squall. 



The study of this interesting seiche disturbance raises a number 

 of highly interesting points, which, however, I cannot discuss to-night. 



[G. C] 



