Sun-spots and Terrestrial Phenomena. 



233 



of the full years of the several periods were really identical, and that 

 the differences found are due to difference in the mode of exposure and 

 in the fulness of the registers kept. This is, of course, objectionable 

 on the ground that if there be a real variation of long-period, it will 

 affect the general means of our four series of observations in different 

 degrees, and any result that we arrive at must accordingly be received 

 with caution ; but, on the other hand, the probability of our finding a 

 variation of definite character at all is thereby diminished, and if such 

 a variation should still exhibit itself, it will be in spite of some ten- 

 dency in our mode of procedure to obliterate it. 



3. The general means for the four periods are ll 0- 8, 11 0, 2, 9°'8, 

 and 10° *0. Choosing the last as a standard period, the others are 

 reduced to its scale by multiplying the respective monthly mean 



ranges of Table I by and : the values thus obtained, 



to J 11 -8 11 -2 9 '8 



as well as the monthly and annual means — that is, the means of the 



several horizontal lines and vertical columns — are shown in Table la. 



Table la. — Showing the Monthly and Annual Means of Daily Tempe- 

 rature-Range reduced to a Common Scale. 



Year. 



January. 



February. 



March. 



April. 



03 



June. 



July. 



I August. 



September. 



October. 



November. 



December. 



Mean of year. 



Annual Means 

 smoothed. 



1847 













6-9 



6-2 



6-9 



7-4 



10-3 



13-1 



13-7 







1848 



14-9 



13-1 



11-7 



9-7 



9-1 



6-9 



6-3 



5-8 



8-1 



9-3 



13-1 



13-0 



10*1 





1849 



12-6 



11 -8 



11-2 



10-1 



8-4 



6-9 



6-1 



5-7 



6-1 



10 -4 



12-7 



14-0 



9-7 





1850 



12-6 



15-4 



11-1 



9-9 



8-7 



8-4 



6-9 



6-9 



7-6 



10-1 



13-5 



13-0 



10-3 



10-03 



1851 



13-4 



12-9 



11 -4 



10-8 



9-0 



7-7 



5-7 



6-4 



8-0 



9-6 



11-0 



13-7 



9-9 



10-14 



1852 



13-6 



12-5 



11-9 



11-8 



10-5 



8-3 



6-7 



6-4 



7-1 



9-9 



13-6 



11-5 



10-3 



10-32 



1853 



14-1 



13-4 



13-1 



11-3 



10-6 



7'6 



5-8 



7-6 



7-4 



11-7 



12-8 



14-4 



10-8 



10-45 



1854 



13-8 



14-2 



12 -9 



11-1 



10-3 



8-2 



5-8 



7-1 



7-4 



10-3 



11-7 



10-8 



10-3 



10-36 



1855 



12-3 



11 '8 



11-4 



10-9 



10-3 



8-0 



6-8 



8-0 



8-2 



10-0 



12-4 



12-6 



10-2 



10-11 



1856 



12*3 



12-1 



10-5 



10-9 



10-0 



7-9 



5-9 



7-0 



7-5 



9-3 



11-9 



12--1 



9-7 



9-92 



1857 



11-3 



.13-2 



12-6 



10-9 



9-6 



8-7 



6-6 



4-8 



6-5 



10-0 



11-8 



13-3 



9-9 



9-87 



1858 



13-4 



12-7 



10-5 



10 -8 



9-5 



8-4 



6-8 



6-4 



7-4 



10-2 



12-1 



11-7 



10-0 



9-85 



1859 



12-3 



11-5 



12-1 



10-6 



9-2 



8-0 



7-1 



6-1 



7-4 



9-1 



11-3 



12 -5 



9-7 



9-75 



1860 



13-2 



10-8 



10-7 



9-0 



8-6 



8-1 



5-3 



6-6 



6-9 



8-9 



13-8 



13-6 



9-6 



9-66 



1861 



12-8 



13-7 



11-2 



10-1 



9-6 



7-9 



5-0 



4-8 



7-2 



8-4 



12-1 



12-6 



9-6 



9-69 



1862 



12 '1 



13-1 



11-9 



10-3 



9-4 



7-4 



6-6 



6-9 



7-0 



9-1 



11-4 



13-6 



9-9 



9-80 



1863 



13-0 



14-7 



10-5 



10-3 



9-5 



6-6 



6-3 



6-0 



7-5 



9-8 



12-5 



12-4 



9-9 



9-89 



1864 



13-5 



12-5 



11-6 



9-7 



9-3 



7-9 



5-7 



6-3 



8-2 



10-8 



11-3 



13-1 



10-0 



9-91 



1865 



13-0 



11-9 



11 -3 



10-1 



9-1 



8-5 



6-3 



5-6 



8-2 



9-9 



12-1 



11-2 



9-7 



9-97 



1866 



13 7- 



14-0 



11-0 



11-1 



9-4 



7-1 



6-0 



5-7 



8-1 



10-8 



14-3 



13-6 



10-4 



10-08 



1867 



13-3 



14-0 



11 8 



9-7 



8-9 



7-4 



6-1 



5-7 



6-9 



10-2 



12-6 



13-5 



10-0 



10-13 



1868 



13-3 



13-1 



11-2 



10-1 



9-3 



7-4 



6-5 



6-0 



7-9 



11 -1 



13-9 



13-7 



10-3 



10-03 



1869 



13-3 



12-7 



10-8 



10-2 



9-4 



7-4 



6-4 



6-2 



6-7 



9-7 



12-3 



10-8 



9-7 



9-85 



1870 



12-8 



13-2 



11 -1 



10-7 



8-9 



7-7 



5-4 



6-4 



7-1 



9-1 



11-0 



12-2 



9-6 



9-77 



1871 



13-1 



12-7 



11-9 



10-4 



8-8 



7-7 



6-6 



6-0 



7-0 



10-6 



11-3 



12-1 



9-9 



9-83 



1872 



13-8 



14-5 



11-3 



10 -6 



9-2 



7-4 



5-4 



6-3 



7'2 



10-6 



13-7 



11-3 



10-1 



9-86 



1873 



13-6 



11-4 



10-3 



9-4 



8-6 



6-5 



4-8 



5-8 



7-0 



11-2 



12-3 



13-8 



9-6 



9-77 



1874 



13-5 



13 -3 



11-2 



10-0 



8-4 



7-1 



5-4 



6-3 



6-5 



10-4 



12-1 



12-5 



9-7 



9-72 



1875 



13-4 



11-6 



11-0 



10-0 



8-9 



7-2 



6-7 



6-4 



6-1 



10-1 



12 -4 



12-6 



9-7 



9-80 



1876 



13-0 



13-1 



10-6 



9-8 



9-0 



7-5 



5-9 



6-5 



8-0 



11-3 



12-3 



13-8 



10-1 



9-94 



1877 



12-3 



12 -0 



11-5 



10-6 



9 3 



8-1 



7-4 



7-2 



8-4 



8-8 



12-3 



10-9 



9-9 



10-08 



1878 



12*8 



13-5 



11-3 



10-7 



9^4 



8-4 



6-8 



6-5 



7 -7 



10-4 



10-6 



14-1 



10-2 



10-24 



1879 



14-1 



12-6 



12-6 



10-6 



9-0 



7-2 



7-0 



6-0 



7-8 



10-4 



13-8 



15-3 



10-5 





1880,,, 



14-6 



13-6 



11-2 



10 -4 



9-3 



8-2 



6-7 



7-2 



7-3 



10-1 



12-9 



13-9 



10-4 





Means of ) 

 columns. J> 



13-18 



12-91 



11-41 



10-38 



9-29 



7-66 



6-21 



6-34 



7-38 



10-06 



12 -42 



12-85 



10-0 





R 2 



