66 REPORTS ON THE STATE OF SCIENCE.—1913. 
column of the accompanying table the year is given, and in the second 
and third columns the number of eruptions and earthquakes. The 
earthquake numbers are taken from the ‘ Catalogue of Destructive 
HKarthquakes,’ published in the Report for 1911. In this table we 
have entries relating to 110 years. When we compare successive 
years we see, for example, that in 1790 there were 14 eruptions and 
11 earthquakes, but in the year following the number of eruptions 
had fallen to seven, while the number of earthquakes remained 
constant—volcanic activity had decreased while seismic activity 
suffered no change. 
No. of | No. of No. of | No. of No. of | No. of 
Year Erup- | Earth- Year Erup- | Harth- Year Erup- | Earth- 
tions | quakes tions | quakes | tions quakes 
1790 14 11 1827 20 16 | 1864 10. | 432 
1791 7 ll 1828 21 23 =| :~:1865 10 24 
1792 7 7 1829 10 15 || 1866 Ber A Bag 
1793 12 5 1830 15 18 1867 9° fh) 182 
1794 5 1l 1831 10 14 = 1868 Lib Pos 
1795 5 4 1832 9 7 1869 20. et - 41 
1796 10 6 1833 8 9 |) 2870 12 28 
1797 ll 4 1834 10 Il || Ysa 16 33 
1798 5 6 1835 12 ll 1872 24 30 
1799 8 4 1836 16 11 1873 5 38 
1800 5 6 1837 7 9 || 1874 9 32 
1801 5 6 1838 18 7 1875 12 31 
1802 5 1l 1839 8 16 =~) «1876 9 20 
1803 7 6 1840 10 ll | 1877 22 21 
1804 6 4 1841 9 23. «|| :1878 24 32 
1805 7 6 1842 8 7 || 1879 ll 25 
1806 10 15 1843 18 15 | -:1880 8 35 
1807 6 3 1844 11 14 =| 1881 5 45 
1808 6 7 1845 14 | 2i | 1882 5 27 
1809 4 | 10 1846 12 26 =| 1883 29 27 
1810 5 toatl 8 1847 19 29 «|| :1884 fae’ [ser 
1811 7 8 1848 14 20 =|) 1885 18/, Airey 
1812 11 18 1849 12 17 1886 18 29 
1813 2 6 1850 1l 14 1887 8 34 
1814 7 10 1851 10 30 1888 8 34 
1815 7 10 1852 | 330 35 =| 1889 7 33 
1816 4 3 1853 1l 35 =|) ~:1890 5 19 
1817 7 5 1854 16 27 ~——-:1891 5 20 
1818 9 9 1855 17 36 =| +1892 8 24 
1819 8 12 1856 27 30 1893 7 30 
1820 13 7 1857 20 32 1894 19 | 42 
1821 9 12 1858 8 36 1895 Die Dl eet oO 
1822 22 14 1859 | 10 24 1896 3 ca. 26 
1s23 P12 | 7 1860 ll 26 =| «1897 3 35 
1824 | Sees LO 1861 8 35 1898 aes SS Oe 
TSO | SPL Oee 9 1862 10 43 1899 8 | 18 
1826 | 10 8 1863 8 34 1900 3 / — 
Prof. H. H. Turner writes to me about the above table as’ follows :— 
“Tf we calculate the correlation between these annual totals as 
they stand, we obtain the coefficient 
r= +0°450°05. 
But there is a systematic effect which should first be eliminated. A 
