180 Field Museum of Natural History — Geology, Vol. III. 



1824 .... . 3 1846 4 1868 11 1890 6 



1825 2 1847 2 1869 6 1891 2 



1826 2 1848 3 1870 3 1892 3 



1827 3 1849 1 1871 3 1893 4 



1828 1 1850 2 1872 4 1894 3 



1829 3 1851 2 1873 3 1895 3 



1830 2 1852 4 1874 5 1896 4 



1831 2 1853 3 1875 5 1897 6 



1832 o 1854 1 1876 5 1898 3 



1833 1 1855 4 1877 7 1899 5 



1834 2 1856 3 1878 5 1900 3 



1835 3 1857 6 1879 6 1901 3 



1836 3 1858 4 1880 3 1902 5 



1837 1 1859...... 5 1881 2 1903 3 



1838 5 i860 5 1882 4 1904 1 



1839 1861 3 1883 3 1905 3 



1840 3 1862 2 1884 3 1906 o 



1841 3 1863 6 1885 4 1907 1 



1842 3 1864 3 1886 7 1908 o 



1843 5 1865 7 1887 6 1909 o 



1844 3 1866 6 1888 o 



1845 3 1867 2 1889 5 350 



This record on the whole seems to indicate a comparatively uni- 

 form supply of meteorites, which is the more remarkable when one 

 considers the various chances affecting the observation of their fall. 

 The record seems to afford no evidence of cycles or periodicity which 

 can be traced with certainty. Still the record of years is perhaps not 

 as satisfactory for establishing conclusions in this regard as is that 

 of other periods. As the writer has shown elsewhere* at least 900 

 meteorites probably reach the earth yearly. Of these only an 

 average number of three is recorded, so that it is evident that a large 

 allowance must be made for unrecorded ones. Yet it is fair to pre- 

 sume that those recorded are typical of the whole, because while 

 opportunities for observation of meteorite falls have probably con- 

 tinually increased in number since 1800, the record by decades shows 

 that the decade from i860 to 1870 considerably exceeded in number 

 of falls either of the two succeeding ones. 



Passing from the falls by years, the falls by months may be ex- 

 amined. Such an examination should have an especial significance 

 in showing the relations which meteorites may have to well-known 

 star showers. Two of the best known of these showers occur in 

 August and November. If meteorites are related to these, these 

 months should show a larger fall than others. If meteorites are not 

 related to these, no special increase for these months should be shown. 

 * Pop. Sci. Mon., 1904, pp. 351-354. 



