12 Canadian Record of Science. 



Vaudreuil, P.Q. — Several chimneys were thrown down 

 and the walls of houses were cracked. The people were 

 much excited. 



The earthquake seems to have been felt throughout Que- 

 bec and Ontario and in the New England States and New 

 York. So fur as appears from the newspaper accounts it 

 seems to have been most severe in Western Quebec and 

 Eastern Ontario. 



In Montreal it was sufficiently violent to cause a percep- 

 tible movement in buildings, enough in many cases to 

 produces a panic among the inmates, the effect being de- 

 scribed as resembling that of a violent explosion within the 

 building, or the fall of some heavy object from the ceiling. 

 The higher buildings in the lower part of the city were 

 naturally the most affected, but no serious damage is re- 

 corded except in one instance, from the fall of planks from 

 a scaffolding. In a few instances cracks were produced in 

 the walls of buildings. 



Dec. I — Another shock was felt at several places on the 

 Lower St. Lawrence. Moisie, Labrador, 5 a.m.; Seven 

 Islands, Saguenay, 5.30 a.m. The shock is said to have 

 been strong. 



The following hints as to recording the intensity of earth- 

 quake shocks, based upon the Rossi-Forel scale, adopted by 

 the Italian and Swiss seismologists, are taken from Prof. 

 Kockwood, for the benefit of future observers, {American 

 Journal of Science, July, 1886) : 



General Designation. More Particular Classification. 



( I. Eecorded by a single seismograph 



I or by seismographs of the same 



» r . ••iii model, but not putting in motion 



Microseismic shock < . ' , va-*** *4. 



seismographs ot different patterns ; 



reported by experienced observers 

 I only. 



' II. Shock recorded by several seismo- 

 graphs of different patterns ; re- 

 ported by a small number of per- 



Very light \ sons at rest. 



III. Shock reported by a number of 

 persons at rest; duration or' direc- 

 tion noted. 



