284 THE CANADIAN NATURALIST, [Sept. 



L'Orignal, 11.15. — We felt a very severe shock of earth- 

 quake, which lasted about half a minute. It shook the Court 

 House iu which the telegraph office is, 



Coteau Landing. — Severe shock of earthquake this morn- 

 ing ; shook buildings. 



Ottawa, Oct. 20. — A strong shock of earthquake here 

 this forenoon. Drizzling rain and cold. 



St. Catherines. — A shock of earthquake felt here. 



Owen Sound, Oct. 20. — A shock of earthquake was felt 

 here this morning, commencing at 10.52, and lasted about 3 

 minutes. 



In several places it is noticed that the shock was much more 

 severe on sandy and loose ground than on solid rock. This is an 

 ordinary occurrence, depending on the rapid and unobstructed 

 passage of the vibrations through solid rock. This same cause no 

 doubt accounts for the circumstance that at some places the shock 

 was not felt at all, while in others not far distant it was felt 

 severely. 



The following notice sent to one of the newspapers by Mr. 

 Bennetts, of the Capel Mine, is curious, as in other cases such 

 shocks are often felt severely in mines ; but the rapid or vertical 

 transmission of the shock may account for it in connection, per- 

 haps, with the direction of the vein and of the workings. — "At 

 this mine the shock of the earthquake was very plainly felt at the 

 surfacs ; but at the time of its occurence I was some 200 feet un- 

 derground and neither the miners, of whom there were about 

 twenty, nor myself, felt the shock or noticed anything unusual. 

 Could it be ascertained, it would be interesting to know to what 

 extent other mines were affected by such an unusual occur- 

 rence." 



On the other hand I am informed by Mr. James Douglas, 

 of Quebec, that in the Harvey Hill Mine, in rock not dissimilar 

 from that at the Capel Mine, and in the same region, though 

 more to the eastward, the shock was sufficiently violent to throw 

 down masses of rock, and greatly to terrify the miners, then at 



work in the mine. 



In a notice contributed to Silliman's Journal, for November, 

 by Prof. Newton, it is stated that the first shock began at New 

 Haven, at llh. 19.m45s. A.M., New Haven mean time. "It 

 lasted 10 seconds, and its individual vibrations were about two 

 thirds of a second in duration, or one and one third of a second 



