ON THE BAROMETER. 211 



1. With regard to the time of beginning to rise or fall. 



2. With regard to the time of ceasing to rise or fall. 



3. With regard to the steps or degrees by which the 



Mercury rises or falls. 



4. With regard to the limits or extremes to which it 



rises or falls. 

 Being under the necessity of acknowledging our 

 ignorance of the cause which produces these prevail- 

 ing tendencies themselves, we can of course have no 

 adequate idea or conception in, theory of the different 

 circumstances that are capable of producing the differ- 

 ent variations which appear in their general character j 

 and our observations being much too limited to esta- 

 blish, concerning them, anything like practical rules, 

 we must remain contented for the present with point- 

 ing them out as questions which want investigation: 

 expressing however a strong suspicion that thev are 

 not unconnected with the relative positions of the 

 Moon, and the other planets. 



The Application. 



XIV. 



At the time of digesting the ideas which I have 

 delivered upon this subject, being possessed of no 

 information but that which was communicated in 

 Mr. Farquhar's letter, and what 1 obtained after- 

 wards from myown observations, I did not conceive 

 that I was authorized to extend the propositions 

 which I have advanced (XII.) respecting these ten- 

 dencies, beyond the limits of Calcutta. By a note, 

 however, which is just now pointed out to me in Dr. 

 Mose lev's very ingenious Treatise on Tropical Dis- 



P 2 eases. 



