DISCUSSION OF THE VERTICAL FORCE. 



Table I.- 



-Uncorrected Monthly Means of Vertical, Force Magnetometer and correspond- 

 ing Mean Monthly Temperatures. 



1841 

 February 

 March 

 April 

 May 

 June 

 July 

 August 

 September 

 October . 

 November 

 December 



1842 

 January 

 February 

 March . 

 April . 

 May . 

 Juue . 



1059''.0 

 1236.2 

 1357.4 

 1445.6 



722.6 

 810.3 

 776.1 

 702.5 

 448.7 

 339.8 

 534.1 



679.4 

 695.5 

 668.9 

 671.2 

 693.9 

 718.0 



350.58 

 43.96 

 50.8 

 56.2 

 74.5 

 77.6 

 75.85 

 71.1 

 54.5 

 47.8 

 59.6 



67.7 

 65.0 

 66.8 

 67.4 

 69.7 

 71.9 



July . . 

 August 

 September 

 October . 

 November 

 December 

 1843 

 January 

 February 

 March 

 April 

 May 

 June 

 July 

 August 

 September 

 October . 

 November 

 December 



792''.9 

 775.9 



775.0 

 763.8 

 725.0 

 672.8 



681.9 



64.0 



615.8 



57.6 



555.5 



53.8 



762.4 



71.3 



734.1 



70.4 



784.6 



75.9 



800.5 



77.4 



817.1 



77.8 



797.9 



74.3 



749.0 



69.6 



728.Q 



64.7 



705.9 



62.5 



770.5 

 75.4 

 74.3 

 71.4 

 66.8 

 62.5 



1844 

 January 

 February 

 March 

 April 

 May 

 June 

 July 

 August 

 September 

 October . 

 November 

 December 



1845 

 January 

 February 

 March . 

 April . 

 May . 

 Juue . 



636'i.l 

 657.4 

 769.5 

 750.1 

 798.4 

 845.1 

 913.2 

 877.2 

 860.7 

 834.7 

 748.2 

 695.6 



712.6 

 650.1 

 775.7 

 721.1 

 688.8 

 811.1 



570.0 

 59.2 

 67.2 

 65.4 

 69.9 

 73.6 

 77.2 

 75.4 

 71.7 

 71.2 

 63.9 

 60.8 



62.2 

 56.3 

 60.2 

 65.7 

 64.1 

 74.2 



Combining the preceding values by months, we obtain a complete series extending 

 over four years. The first five months are necessarily omitted ; the break in the 

 series occurred between the 4th and 5th month. 



Uncorrected readings of the vertical force magnetometer. One division of scale 

 =0.000033 parts of the vertical force. 



Month. 



1841-42. 



1843-43. 



1843-44. 1844-4.5. 



1841 -4.5. 



July . 



August . 



September 



October . 



November 



December 



January 



February 



March . 



April 



May 



June 









810.3 



776.1 

 702.5 

 448.7 

 339.8 

 534.1 

 679.4 

 695.5 

 668.9 

 671.2 

 693.9 

 718.0 



792.9 



775.9 



775.0 

 763.8 

 725.0 

 672.8 

 681.9 

 615.8 

 555.5 

 762.4 

 734.1 

 784.6 



800.5 

 817.1 

 797.9 

 749.0 

 728.0 

 705.9 

 630.1 

 657.4 

 769.5 

 750.1 

 798.4 

 845.1 



913.2 

 877.2 

 860.7 

 834.7 

 748.2 

 695.6 

 712.6 

 650.1 

 675.7 

 721.1 

 688.8 

 811.1 



829.2 

 811.6 

 784.0 

 699.1 

 635.2 

 652.1 

 677.5 

 654.7 

 667.4 

 726.2 

 728.8 

 789.6 



Mean 



721.3 



Corresponding readings of the tliermometer (F.). 



Month. 



1841-42. 



1842-43. 



1843-44. 



1844-45. 



1841-45. 



July . 



August . 



September 



October . 



November 



December 



January 



February 



March . 



April 



May 



June 









770.6 



75.85 



71.1 



54.5 



47.8 



59.6 



67.7 



65.0 



66.8 



67.4 



69.7 



71.9 



770.5 

 75.4 



74.3 

 71.4 

 66.8 

 62.5 

 64.0 

 57.6 

 53.8 

 71.3 

 70.4 

 75.9 



770.4 



77.8 

 74.3 

 69.6 

 64.7 

 62.5 

 57.0 

 69.2 

 67.2 

 65.4 

 69.9 

 73.6 



770.2 

 75.4 



71.7 



71.2 

 63.9 

 60.8 

 62.2 

 56.3 

 60.2 

 65.7 

 64.1 

 74.2 



770.42 



76.11 

 72.85 

 66.68 

 60.80 

 61.35 

 62.72 

 59.53 

 62.00 

 67.45 

 68.52 

 73.90 



Mean 



67.45 



