IN THE NORTH AM ERIC AX LAKES. 



17 



ponod from high to Ioav, is the greatest in its range; but to this there are exceptions 

 On the morning of the 12th the water was still in motion, as it was tlie evenin-^ 

 before, the weather being very ealm, with a ground swell, coming in from the open 

 Lake At eleven o'clock A. M. it increased in rapidity, and in tiie range. About 

 the Hth of the same month, another severe gale set in from the northwest and 

 continued three days. The remainder of the month was calm. 



In the year 185.5, the first oscillations of the season were noticed on the 2()tli 

 of June, at 10 o'clock A. M., the weather being calm and clear. 



The same thing occurred in the same kind of weather on the 2()th, and a-ain on 

 the 13th of July. Hitherto, since the 22d of April, when the Lake ice broke up 

 there had been no prolonged gales nor storms, and only a ivw thunder--usts On 

 tlie 14th, 15th, Kith, 17th, 18th, 19th, the movements were almost continuous. At 

 the Sault, as Mr. Emerson informs mo, the water rose three feet three inches on 

 the ISth. The weather was cloudy and rainy, with frequent thunder-storms- but 

 the Lake was calm most of the time. From the 24th to the 31st fluctuations 

 occurred daily, with close, calm, cloudy, and foggy weather, the thermometer at 

 night varying from 55° to 88° F. 



From the 1st to the 12th of August, inclusi\e, there was no cessation of the 

 oscillation, except for parts of two days. During this time there was but one o-ale 

 which was from the west, on the Oth instant, and lasted twenty hours. Thunder! 

 storms were frequent, between which the sky was clear and the" Lake calm. 



I did not notice any more till the 25th of August. Li the meantime the autunui 

 winds had set in. During the afternoon of the 25th a violent thunder-storm arose 

 from the northwest, and the oscillations came on as rapidly and as marked as at 

 any period of the summer. Again, on the 3()th and 31st the same tiling occurred in 

 calm weather, a thunder-storm having taken place during the intervening night. 

 This phenomenon was observed in the month of September on eleven different 

 days, and three times during the first eight days of October; after which, my 

 residence having been changed, the observations ceased. 



The month of September on this Lake and on Lake Erie was more stormy than 

 the month of October. Whether these movements occur in the winter season, I 

 am unable to say. 



For the purpose of furnishing memoranda covering, as wide a space as possible, I 

 insert two more tables of an hour's readings each, one on the 2d, and another on 

 the 3d of August, 1855, in different parts of tin; day. 



