234 



Mr. C. Chambers. 



4. The annual means in the last column are obtained from those in 

 the next preceding column in the following manner, the object being 

 to remove the irregularities in the progression of the latter numbers 

 and to substitute for those numbers a smooth-fiowiug series that will 

 retain all the principal characteristics of any variation of long-period 

 that affects them : first, the means are taken of every two adjacent 

 numbers forming a new series the number of which is one less than 

 the number of years ; second, the new series of numbers is treated in 

 the same manner, giving a second new series : and the process is 

 repeated a third and a fourth time, the last-resulting series of numbers 

 being those entered in the last column of Table la. The annual 

 means and the smoothed annual means are curved in fig*. 1, and the 

 latter curve shows distinct maxima in 1853 and 1867, and minima in 

 1860 or 1861 and between 1870 and 1874, times that imply a rough 

 general correspondence of ebb and flow with that of an inverted sun- 

 spot curve for the same period. 



5. The numbers at the foot of Table la we adopt as representing 



Table II. — Exhibiting the Proportional Temperature-range, the 

 Normal for each Month being reckoned == 100. 



Year. 



January. 



February. 



p 



April. 



May. 



June. 



July. 



1 



August. 



3 



o 

 p< 



a> 



October. 



November. 



December. 



Annual Means. 



1847 .. 













90 



100 



110 



100 



102 



106 



107 





1848... 



113 



102 



103 



93 



98 



90 



102 



92 



109 



92 



106 



102 



100 -2 



1849... 



95 



91 



98 



97 



90 



90 



98 



90 



82 



103 



102 



109 



95-4 



1850... 



95 



119 



97 



95 



94 



109 



111 



110 



103 



100 



109 



102 



103-7 



1851... 



102 



100 



100 



104 



97 



100 



92 



102 



108 



95 



89 



107 



99-7 



1852... 



103 



97 



104 



113 



113 



108 



108 



102 



96 



98 



110 



90 



103 -5 



1853... 



107 



104 



115 



109 



114 



99 



94 



121 



100 



116 



103 



112 



107-8 



1854... 



105 ' 



110 



113 



107 



111 



106 



94 



113 



100 



102 



94 



84 



103-2 



1855... 



93 



88 



100 



105 



111 



104 



110 



127 



111 



99 



100 



98 



103-8 



1856... 



93 



94 



92 



105 



108 



103 



95 



111 



101 



92 



96 



95 



98-7 



1857... 



86 



102 



110 



105 



103 



113 



106 



76 



88 



99 



95 



104 



98-9 



1858... 



102 



98 



92 



104 



102 



109 



110 



102 



100 



101 



98 



91 



100-7 



1859... 



93 



89 



106 



102 



99 



104 



115 



97 



100 



90 



91 



98 



98 -7 



1860... 



100 



84 



94 



87 



92 



105 



85 



105 



93 



88 



111 



106 



95-8 



1861... 



97 



106 



98 



97 



103 



103 



81 



76 



97 



83 



98 



98 



94-7 



1862... 



92 



102 



104 



99 



101 



96 



106 



110 



95 



90 



92 



106 



99-4 



1863... 



98 



114 



92 



99 



102 



86 



102 



95 



101 



97 



101 



97 



98-7 



1864... 



102 



97 



102 



93 



100 



103 



92 



100 



111 



107 



91 



102 



100-0 



1865... 



98 



92 



99 



97 



98 



108 



102 



89 



111 



98 



98 



87 



98*1 



1866... 



104 



109 



96 



107 



101 



92 



97 



90 



109 



107 



115 



106 



102-7 



1867... 



101 



109 



104 



93 



96 



96 



98 



90 



93 



101 



102 



105 



99-0 



1868... 



101 



102 



98 



97 



100 



96 



105 



95 



107 



110 



112 



107 



102-5 



1869... 



101 



98 



95 



98 



101 



96 



103 



98 



91 



96 



99 



84 



96-7 



1870... 



97 



102 



97 



103 



96 



100 



87 



102 



96 



90 



89 



95 



96 -2 



1871... 



99 



98 



104 



100 



95 



100 



106 



95 



95 



105 



91 



95 



98 -6 



1872.. 



104 



112 



99 



102 



99 



96 



87 



100 



97 



105 



110 



88 



99-9 



1873.. 



103 



88 



90 



90 



92 



84 



77 



92 



95 



111 



99 



108 



94-1 



1874.. 



102 



103 



98 



96 



90 



92 



87 



100 



88 



103 



98 



98 



96-2 



1875.. 



102 



89 



96 



96 



96 



94 



108 



102 



82 



100 



100 



98 



96-9 



1876.. 



98 



102 



93 



94 



97 



97 



95 



103 



108 



112 



99 



108 



100-5 



1877.. 



93 



93 



101 



102 



100 



105 



119 



114 



114 



87 



99 



85 



101-0 



1878.. 



97 



105 



99 



103 



101 



110 



110 



103 



104 



103 



85 



110 



102 -5 



1879.. 



107 



98 



111 



102 



97 



94 



113 



95 



105 



103 



111 



120 



104-7 



1880.. 



111 



105 



98 



100 



100 



106 



108 



114 



99 



100 



104 



109 



104-5 



