10 



DISCUSSION OF THE VERTICAL FORCE. 



Notes to the above table : January 4th, February 1st, and Marcli 24th, observations 7 m , 7| m , and 

 20 m late, respectively. In April seven readings were supplied by the observers, also one in May 

 and one in June. July 14th, O h 23^ m , observation 6 m late. August 10th, 16 h 23 m , observation sup- 

 plied by observer. August 29th, O h 23| m , observation 12 m late. September 20th, O h 23^ m , tempera- 

 ture supplied by observer. November, six readings supplied by observers. December 1st, 4 h 23i m ; 

 December 9th, l h 23 m ; December 12th, 21 h 23| m , and December 22d, 5 h 23^"', observations 5 ra , G m , 

 15 m , and 8 m late, respectively. December 19th, 2 h 23^ m , a printing error of 200 scale divisions was 

 corrected. December 30th, 9 h 23j m , reading supplied by observer. 



