New Brunswick in New Jersei/, U. S., June 19, 1835. 27 



the trees are not unfrequently torn out of the ground and 

 carried onward to considerable distances. 



It is proper to state here, that in the tracks of all the tornadoes 

 which I have had opportunity to examine, and in some, at 

 least, of those examined by others, the course of rotation has 

 been found the same as in the case before us *. 



In order to make a just and satisfactory examination of the 

 effects of a tornado, it appears necessary to select portions of 

 the track where the extension of wood or single trees, on 

 each side, is found sufficient to mark clearly the exterior 

 limits of the prostrating power, and where the effects on 

 both sides of the axis are also clearly developed. Our next 

 care should be to ascertain, as near as may be practicable, 

 the line which separates the opposite convergence of the two 

 sides, noticed above as the axis or line of convergence. We 

 should then determine the general direction of this line and 

 of the track at the place examined ; which being done, we 

 may proceed to measure the distance to which the prostra- 

 tions are extended on each side, and then carefully to take 

 the position and direction of prostration of each and all of the 

 fallen bodies, noting with care, also, any other phijenomena 

 which may serve to aid our inquiries. We may thus obtain 

 valuable materials for future analysis ; and this course of in- 

 vestigation, if faithfully pursued, will, it is believed, I'emove 

 all reasonable doubt of the rotative action of these tornadoes. 

 An examination of their probable origin and the causes of 

 their enduring activity and violence, belongs not to the pre- 

 sent ocasion. 



New York, July 20, 1840. 



Schedule of Observations on the Directions of the T?'ees pro- 

 strated by the Tornado of June 19, 1835, near New Bruns- 

 wick., N. J. Course of the Toriiado, East. 



As in the tornado which passed through Allegany county, New York, 

 July 25, 1838, described by Mr. Gaylord in the American Journal of Sci- 

 ence, vol. xxxvii. p. y2. 



