Mr. Redjield's Reply to Dr. Hare. 303 



Now to all this, I answer: 1. That, to my apprehension, the 

 essential features of the trade winds can be best explained with- 

 out assigning the agency of temperature as the chief moving 

 power. 2. It is an error to say, that I reject the influence of heat. 



3. I consider the influences of momentum, centrifugal force, and 

 centripetal action, as being comprised in the laws of gravitation. 



4. It is true that I do not consider " electricity" as a general 

 cause of atmospheric currents ; for the reason, that so far as I 

 know, this has never been shown. 5. That the only effect of 

 gravitation, without calorific or electrical reaction, would be to 

 produce " a state of inert quiescence," in the atmosphere of a 

 moving and rotative planet like our own, is to me inconceivable. 

 6. I have never considered nor asserted "momentum" to be "the 

 antagonist of gravitation." In the paragraph which is quoted by 

 Dr. Hare, I had suggested the courses of great storms as indica- 

 ting the law of circulation in our atm,osphere, and which I deem- 

 ed to he founded mainly on the laws of gravitation. By some 

 mistake, he has given the phrase " causes of great storms" in- 

 stead of courses ; and proceeding on this error, he calls it a sum- 

 ming up of the "causes" of atmospheric currents: although he 

 alleges at the same time, that I here admit but one cause. 



It is next asked, "If the minuteness of the altitude of the 

 atmosphere in comparison with its horizontal extent, be an objec- 

 tion to any available currents being induced by calorific rarefac- 

 tion," as he states I have alleged, " wherefore should not momen- 

 tum or any other cause diminishing or counteracting the iiifiuence 

 of gravity, be on the same account equally inefficient?" To this 

 I answer : — 1. Momentum, and the other modifications of the 

 gravitating power, are of far greater magnitude and force than the 

 influence of the mere difference of temperature in the several 

 geographical or climatorial zones. 2. The main tendency or re- 

 sult of this greater force is to produce horizontal, not vertical 

 motion. 3. The words which I have italicised, show only the 

 misapprehension corrected above, and which appears to run 

 through the strictures which I am noticing. By " available cur- 

 rents," as above quoted, I here understand the great currents of 

 the atmosphere, constituting the trade winds, &c. 



In succeeding paragraphs [10-12] Dr. H. criticises the terms 

 by which I have endeavored to point out, that a whirling or ro- 

 tative movement is the only known cause of a violent and destruc- 



