98 Dr. Hare's Additional Objections to 



72. On opposite sides of the same leaf we find the preceding 

 quotations, Agreeably to the first, there is a constant acces- 

 sion of air from the exterior atmosphere to the body of a 

 whirlwind, attended by an upward force and compensated by 

 a discharge at one extremity of its axis of rotation ; agreeably 

 to the last, the centrifugal action tends to withdraw the air of 

 the centre by causing a transfer or accumulation towards the 

 exterior border. 



73. In tornadoes the author admits the undeniable exist- 

 ence of an ascending column at the axis (92.), and we are told 

 that a whirlwind storm " operates in the same manner and 

 exhibits the same general characteristics as a tornado* ;" but 

 this idea is evidently irreconcilable with that of a withdrawal 

 of air from the centre, agreeably to one of the contradictory 

 allegations above cited. 



74. Nor are the following observations more consistent. 

 " During the passage of these eddies or storms over the place 

 of observation the barometer sinks while under their first or 

 more advanced portions and rises as they pass over or recede." 

 (Silliman's Journal, vol. xxv. p. 129.) " The barometer, 

 whether in higher or lower latitudes, always sinks while under 

 the first portion or moiety on every part of its track excepting 

 perhaps its extreme northern margin." " The mercury in 

 the barometer always rises again during the last portion of 

 the gale and commonly attains the maximum of its elevation 

 on the entire departure of the storm." 



75. But if " a higher state of the barometer be created 

 around the exterior border of a whirlwind than at the centre," 

 and if of necessity the exterior border be first encountered, 

 how does it happen that precisely about this space, agreeably to 

 the statement last quoted, the barometrical column should sink? 

 And if, agreeably to the statement quoted previously, the air 

 be rarefied about the centre and accumulated towards the 

 border, in passing from the one border to the other through 

 the centre, would not the mercury in the barometer first rise, 

 then sink, and afterwards rise again, instead of falling during 

 its exposure to one moiety of the storm, and rising during ex- 

 posure to the other? 



76. It may be presumed, that respecting the state of the 

 barometer and the movement of the air, within the sphere of his 

 whirlwinds, Mr. Redfield's views are not in accordance with 

 any settled notions. His theory leads to the idea of a centri- 

 fugal force, rarefying and removing the air from the centre, 

 while his observation of the ascending current in tornadoes 

 has tended to create an opposite impression. 



* Silliman's Journal, vol. xxv. p. 117. 



