4-70 Earthquake in Canada, 



For example: Let the temperature of 100 cubic inches of 

 gas be 32°, and it is required to find the bulk at 212°; then 



/ = 212-32=180,andA= 100, hence^^^^^:^ti!?)= 137.5 = 3. 



Again: Let the bulk at 212° be 137-5 cubic inches, required 

 the bulk at 32°. In this case also we have ^=180, and B = 

 137*5, hence 



480x137-5 ,^„ . 



Another example may be taken when the temperature of 

 100 cubic inches is 50° to find the bulk at 60°: in this case 

 /=10°, and A =100, therefore 



100:480+10) 



-,^=102-0833. 



These will be sufficient to show that the gentleman who has 

 attempted to correct the writers on chemistry, has given a 

 rule which is not perfectly accurate (see Phillips's Annals of 

 Philosophy for December 1823, p. 415). He makes the bulk, 

 as increased by expansion, in the last example only 102-008. 

 In fact, the rules given by the chemical writers he has quoted, 

 are accurate when the temperature is increased; while his own 

 is only correct when the one of the temperatures happens to 

 coincide with the freezing point. X. 



EARTHQUAKE IN CANADA. 



Quebec, Sept. 10. 

 On the 28th of last month, about three o'clock in the after- 

 noon, the inhabitants of the village of Hayotte, in the parish 

 of Champlain, were alarmed by the following extraordinary 

 occurrence : — A tract of land, containing a superficies of 207 

 arpents, w^as suddenly moved five or six arpents (about 360 

 yards) from the water's edge, and precipitated into the river 

 Chamjjlain, overwhelming in its progress barns, houses, trees, 

 and whatever else lay in its course. The earth thus removed 

 dammed up the river for a distance of 26 arpents. The effect 

 was instantaneous, and accompanied by an appalling sound ; 

 a dense vapour, as of pitch and sulphur, filled the atmosphere, 

 oppressing those who witnessed this awful convulsion almost 

 to suffocation. The course of the river being thus obstructed, 

 the waters swelled to a great height, but must rise seven or 

 eight feet more before they can find a passage. Various causes 

 are at present assigned for this singular phsenomenon — such as 

 the effect of a volcanic eruption, or an earthquake ; and by 

 others u u supposed to have been produced by the water 

 having insmuatea-..^^jf^gj^,^gj^ ^^^ strata of clay and the sub- 

 jacent bed ot sanG. J 



