ANNIVERSARY ADDRESS. ~ af 
minutes great foam-crested waves could be seen in the middle, 
and the recording-gauge at once showed what was the matter; 
the wind had blown the water away from the south end and re- 
duced the general level 3 inches. In ten minutes the squall was 
over, and the water began to recover its level, in doing which the 
current set towards the south end of the lake, and could be seen 
running past the jetty at the rate of about 2 miles per hour; 
but it did not stop when the old level was reached—the momentum 
carried it beyond that point, and raised the water up at the south 
end of the lake. Then it turned and ran back again, repeating 
this process time after time at intervals of about two hours, the 
rise and fall getting gradually less, until in about eight hours, 
the water was almost still, when suddenly, at 11°30 p.m., the 
water began to rise faster than ever, and in thirty minutes had 
risen 4 inches ; it then turned and fell nearly as fast as it had risen, 
and reached its lowest point in one hour forty-one minutes, having 
fallen exactly 6 inches. At Douglas House the night was fine and 
calm, without the sign of a storm ; yet it seems probable that a 
storm passed over the north end of the lake, and started the 
motion, which kept on at intervals of about two hours for fourteen 
hours, the rise and fall gradually getting less. I was fortunate 
enough to be present and see so much of the record and the 
corresponding weather. You have no doubt noticed that one set 
of pulsations was started by a sudden fall and the other by a 
sudden rise in the lake, and that the impulse which caused the 
water to rise was greater than the other. Similar impulses have 
kept the lake in almost constant motion ever since, and when once 
under way, they will go on throughout a gale of wind with just 
as much regularity as in a calm. Ordinarily such a set of 
motions lasts ten or twelve hours, decreasing gradually as if the 
friction of the water stopped it, but on several occasions they 
have kept on for days together. 
The most remarkable impulse yet recorded was on the 14th of 
April, when the water was remarkably still, and had been so 
during the 11th, 12th, and 13th. At 11 am. on that day Mr, 
- E : 
