178 



Vincennes, Indiana, October 1, lat. 38° 43' N., long. 87° 29' W., 



Dip (two series, at two stations) 69° 52 '.8. 



Cincinnati, Ohio, Oct. 5, lat. 39° 06' N., long. 84° 27' W., Dip 

 70° 27'.7. 



Columbus, Ohio, Oct. 7, lat. 39° 57' N., long. 83° 03' W., Dip 

 71° 03'.7. 



Hebron, Ohio, Oct. 8, lat. 39° 59' N., long. 82° 29' W., Dip 

 (two stations) 71° 10.1. 



Frazersburgh, Ohio, Oct. 9, lat. 40° 09' N., long. 82° 08' W., 

 Dip (two stations) 71° 48'.7. 



Dover, Ohio, Oct. 11, lat. 40° 33' N., long. 81° 30' W., Dip 

 72° 19' .2. 



Fulton, Ohio, Oct. 12, lat. 40° 55' N., long. 81° 38' W., Dip 

 72° 38'.9. 



Clinton, Ohio, Oct. 12, lat. 40° 58' N., long. 81° 40' W., Dip 

 72° 44'.0. 



Hudson, Ohio, Oct. 27, lat. 41° 15' N., long. 81° 27' W., Dip 

 72° 48'.7. 



Hudson, Ohio, November 13, lat. 41° 15' N., long. 81° 27' W., 

 Dip 72° 48'.7. 



Prof. Bache also read a note by Prof. Loomis, as a supple- 

 ment to his paper on the Storm of December 20, 1836, which 

 was referred to a Committee. 



These supplementary meteorological observations include the 

 height of the barometer, and are from the journals of Mr. J. N. 

 Nicollet, at Fort Snelling, lat. 44° 53' N. and long. 93° 12' W., and 

 of Prof. Joseph Ray, at Cincinnati. They are important, as showing 

 that the coincidence of the period of minimum of the barometer and 

 of the change of wind to the N. W. was not general, and lead to 

 an increased curvature in the lines of barometric minimum in the 

 north-western part of the United States. The conclusion which Pro- 

 fessor Loomis draws is, that " the atmospheric wave in latitude 45° 

 travelled with nearly twice the velocity it did in latitude 30°. The 

 entire range of the barometer at Fort Snelling, was .67 inch, about 

 half what it was in longitude 72° in the same parallel. At the same 

 rate, the oscillation would be reduced to about one-third of an inch in 

 the neighbourhood of the Rocky Mountains." 



Mr. Walker read a paper, entitled " Astronomical Observa- 

 tions made at various Places in the United States, by J. N. 

 Nicollet," which was referred to a Committee. 



