METEORS OF NOVEMBER AND AUGUST. 93 



1838, August 39, meteor d, visible path 13.36 miles. 



" e, 12.28 



" f, 31.26 



" g, 20.84 



" h, 26.44 



" i, 0.36 



" k, 13.16 



14 mean 22.64 



For mean duration 1".21, mean velocity 18.71 



Prof. Locke, of the Ohio Medical College, and Mr. Dwells, made correspond* 

 ing observations in Cincinnati, and its vicinity, in August, 1834. The results 

 were published shortly afterwards, in the Cincinnati Gazette of that year. 

 They found the average height about forty-five miles, the average velocity 

 about twenty miles per second, and the average duration about 1'. They also 

 noticed an unusual number of meteors about the 10th of August. 



§, II. — Op the relative Directions of shooting Stars in Space. 

 Division I. — Of the Shooting Stars seen on ordinary Nights. 



The remaining requisite for the complete determination of the orbits of these 

 asteroids is their relative tangential direction as seen by an observer in motion, 

 both orbital and rotary; in other words, the apparent path and direction of 

 the meteor as affected by annual and diurnal aberration. The observation of 

 a single meteor's path gives no clue to the solution of the question. If, how- 

 ever, we mark on a globe the points of appearance and vanishing of a meteor, 

 and connect them by a great circle, then the inclination of the plane of this 

 circle to a line drawn from the centre of the globe to any given point may be 

 measured; or, the problem may be solved analytically, and the inclination 

 computed. Thus, on any occasion in vi'^hich a great number of paths have 

 been delineated, we may assume any point in the sphere as the trial point, and 



VIIT. — Y 



