386 Mr. RedfieUPs Notice of Dr. Hare's 



and not its causes. It is hoped that my remarks above, on par. 

 100, are a sufficient answer. 



It would afford me pleasure to relieve Dr. Hare from any per- 

 plexity in relation to the causes of violence in whirlwind storms ; 

 (par. 107,) but it appears to be necessary that he should first 



abandon his idea of their " collision with the surrounding atmos- 



phere, 3 ' together with his favorite objection in par. 65, that "in 

 a fluid 5 ' the rotary motion near the axis "can be no quicker than 

 in the case of a solid." • 



*In par. 108, Dr. Hare does not show the absence of " continu- 

 ous exciting forces" in a hurricane. Such forces are found in 

 the u continuous" excess of atmospheric pressure which sur- 

 rounds the hurricane or aerial vortex, and in causes which may be 

 included in Prof. Dove's explanations. 



Dr. Hare next endeavors to show that my own and Prof. 

 Dove's view of the forward inclination of the axis of rotation in 

 storms is erroneous. His objections seem founded partly on the 

 term rotating cylinder , which has been used by Prof. Dove to 

 designate the mass of air which constitutes the body of a storm, 

 partly on the erroneous allegation that any other course of rota- 

 tion than " in concentric circles" at " right angles to the axis," 

 must be "inconsistent with enduring rotation," and partly on 

 the limited height of the whirling action as compared with its 

 superficial diameter and extent * (par. 109-112.) 



1 do not perceive that either of these objections can have any 

 weight, as proving that the axis has not a forward inclination. 

 Indeed, such inclination seems far less difficult and more proba- 

 ble in a storm of 400 miles diameter, than of one-fourth of a 

 mile. It is clearly evident that the lowest portion of a progres- 

 sive storm of any kind, must be retarded by its impingement up- 

 on the earth's surface, thus causing its higher portions to be more 

 advanced ; and the fact is abundantly supported by observation. 

 At the time of writing these lines, the rain-scuds in a storm 

 from E. S. E. may be seen, on a low angle of vision, drifting at 

 an elevation of a few hundred feet, with a velocity visibly ex- 

 ceeding that of the nearer aqueous drift which is moving at a 

 lower level. The advanced appearances of a storm are often 

 noticed in the region of clouds many hours before any change 



* For Prof. Dove's statement, see page 334 



