EARTH PULSATIONS. 333 



Loch Lomond rose and fell through about two and a 

 half feet every five minutes, and all the other lochs in 

 Scotland seem to have been similarly agitated. 



At Shirbrun Castle, in Oxfordshire, where the water in 

 some moats and ponds was very carefully observed, it was 

 noticed that the floods began gently, the velocity then 

 increased, till at last with great impetuosity they reached 

 their full height. Here the water remained for a little 

 while, until the ebb commenced, at first gently, but finally 

 with great rapidity. At two extremities of a moat about 

 100 yards long, it was found that the sinkings and risings 

 were almost simultaneous. The motions in a pond a 

 short distance from the moat were also observed, and it 

 was found that the risings and sinkings of the two did 

 not agree. 



During these motions there were several maxima. 



These few examples of the motions of waters, without 

 any record of the motions of the ground, at the time of 

 the Lisbon earthquake, must be taken as examples of a 

 very large number of similar observations of which we 

 have detailed accounts. 



Like agitations, it must also be remembered, were 

 perceived in North America and in Scandinavia, and if 

 the lakes of other distant countries had been provided 

 with sufficiently delicate apparatus, it is not unlikely that 

 similar disturbances would have been recorded. 



Besides these movements in the waters of seas and 

 lakes, at or about the time of great earthquakes, we 

 have records of like movements, which take place as 

 independent phenomena. 



Thus we read that on October 22, 1755, the waters of 

 Lake Ontario rose and fell five and a half feet several 

 times in the course of half an hour.^ On March 31,1761, 



* Phil. Trans, vol. xlix. p. 544. 



