974 Memoir on Indian Earthquakes. [No. 156. 



Calcutta. 



Mean height of Barometer from May to October, .. • 29.606 



Ditto, ditto, November to April, .. .. 20.908 



,. 302 



Ava. 



Mean height of Barometer from May to October, .. .. 29.461 

 Ditto, ditto, November to April, .. .. 29684 



.283 



Saharunpore. 



Mean height of Barometer from May to October, . . . . 28.573 

 Ditto, ditto, November to April, . . . . 28.959 



386 



It therefore appears that daring the six months of the year when the 

 Barometer is lowest, the greatest number of earthquake shocks occur, 

 and further, since during the months of June, July and August, the 

 mean of the height of the Barometric column is lower than at any 

 other period of the year, (taking averages of a number of years), there 

 appears an interesting coincidence between the greatest intensity of 

 the forces to which earthquakes are due, which are displayed during 

 these months, and the minimum weight of the atmospheric column. I 

 note this point as an interesting one, since it has been observed in 

 other earthquake countries, and it appears to be one of those facts which 

 will be found intimately connected with the theory of earthquakes. 



There are other facts, to be noticed immediately, which further esta- 

 blish the connection between the depressed state of the Barometer and 

 the occurence of earthquake shocks, such as heavy rains, hurricanes 

 and storms, a close and sultry state of the air, &c These will be 

 recorded in their proper order and are now merely alluded to as tend- 

 ing to establish the connection just stated. 



6. Direct Thermometric observations on the Thermometer during 

 our Indian earthquakes are as rare as those on the Barometer, but 

 the uniform testimony of observers establishes the fact, that a high 



