Hf, A. Newton—Origin of Comets. 171 
then of such import as to be carefully considered. From the 
list of known cometic orbits I have rejected those for which 
the data on which they were computed seemed to me to be too 
slender to furnish an orbit worth retaining in the present inves- 
Le aprtaew There remained the following 247 orbits, arranged 
n the table according to their inclinations, which are stated to 
the nearest degree 
Table ey the inclinations of the known cometie orbits, 
Year. |Inc.|| Year. |Inc.|| Year. | Inc.|! Year. | Inc. || Year. | Inc. || Year. | Inc.|| Year. | Inc. 
1743} 2/|1556| 32|| 1845 | 56|/1672| 83 || 1871 | 102 || 1739 | 124 || 1857 | 142 
1770} 2 || 1779 | 32}/1790| 57 || 1774 | 83 || 1877 | 102 |} 1857 | 124 || 1843 | 144 
1678 | 3/| 1811 | 32|/ 1802 | 57 || 1863 83 |} 1799 | 103 || 1824 | 125 || 1806 | 145 
1844} 3|/ 1874/32]! 1804/57 || 1846| 85 || 1665 | 104 || 1780 | 126 || 1825 | 146 
568| 4|| 1532 | 33|| 1840 | 58 || 184: 5 || 1823 822 | 126 || 1847 | 147 
1702! 4|/ 1661 | 33 || 1874} 58 || 1861} 85 || 1577 | 105 || 1827 | 126 || 1870 | 147 
1585| 6 || 1857 | 33 || 1680 | 60 || 1863] 85,| 1821 | 106 127 || 1718 | 149 
1746] 6/] 1874} 34// 1773 | 61 || 1863} 85 || 1842} 106 || 1822 | 127 || 1770 | 149 
1834) 6 |) 1618 | 37/| 1810 | 62 || 1762] 86 || 1558 | 107 || 1596 | 128 |; 1790 | 149 
1833| 7 || 1851/38 || 1853 | 62 || 1593} 88 || 1811 | 107 || 1784 | 129 || 1590 | 150 
1869; 7 || 1737 | 39|| 1807 | 63 || 1857 Si} 1 08 || 1797 | 129 || 1846 | 151 
1766| 8 |/ 1826 | 40/| 1863 | 64||1707| 89 || 1854 | 109 || 1799 | 129 || 1781 | 153 
1819| 9// 1850 | 40/1] 1580 | 65 || 1825 ) || 1864 | 110 || 1855 | 129 || 1877 | 153 
Tem. | 10 |] 1769} 41 || 1788 | 65 || 1818 )!} 1699 | 111 |] 1723 | 130 || 1855 | 157 
Faye 852 | 41 || 1684/1 66 || 1826} 91 || 1869 | 112 || 1792} 131 || 16 59 
Win. | 11 || 1854 | 41 |} 1874 66||1865| 92|/1742/113]/1 131 |} 1801 | 159 
1771 1874 | 42 |1 1748/67 || 1871} 92 13 5 | 131 || 1813 | 159 
. | 13 || 1816 | 43 || 1849 | 67 || 1785} 93 || 1854 | 114 || 1852 | 131 || 1858 | 159 
iela | 13 || 1798 | 44|/ 1849 | 67 || 17 95 || 1862 | 114 ]| 1787 | 132 1 
1757 | 13 |} 1815 | 45}} 1758 | 68 || 1683} 96)/ 1796 | 115 || 1868 | 132 || Hal | 162 
Tem. | 13 || 1844 46 || 1850|68|/1848| 96/| 1 16 || 1743 | 134 |] 1866 | 1 
1854 | 14|/ 1744 47/|/ 1785 | 70 || 1859| 96 || 1877 | 116 || 1808 | 134 63 
D’Ar.| 16 || 1845 | 47 || 1763 | 73 || 1873 | 96|| 1818 | 11 1 
1737 | 18 47 || 1812|74||1847| 97 || 1858 | 117 || 1830 | 135 || 1698 | 168 
1867 1783 | 48 || 1851 | 74|| 1854| 97 1 1 1788 | 168 
1847 | 19 ||} 1860 | 48 |} 1729/77 || 1867} 97 || 1853 | 119 |) 1827 | 136 || 1855 | 170 
1818 | 20 || 1847 | 49 [| 1877 | 77 || 1871} 98|| 56 832 | 187 || 1835/1712 
1618 | 21 || 1864 | 49 || 1863 | 78||1813| 99/|| 1793; 120 || 1701 | 138 || 1862 , 172 
1830 | 21 || 1846 | 50 || 1652 | 79 || 1870} 99 0 | 121 || 1798 | 138 || 1759 | 175 
1695 | 22 || 1786 | 51 || 1759 | 79 || 1874} 99 || 1857 | 121 || 1861 | 138 || 1472 | 178 
1858 | 23 || 1793 | 52 || 1860 | 79 || 1847 | 100 || 1877 | 121 || 1862 | 13 64/178 
1826 | 26 || 1840 | 53 || 1860 | 79 || 1858 | 100 || 1846 | 122 || 1337} 1 
| 29 || 1843 | 53 || 1840 | 80 || 1433 | 101 3/122 66 | 139 
1873 | 30 | Tuttle 54 || 1961 | 80 || 1677 | 101 || 1870 | 122 || 1792 | 1 * 
1846 | 30 || 1706 | 55 || 1819 | 81 || 1747 | 101 || 1873 | 122 || 1808 | 141 
1686 31 "1824 ' 65! 1781! 82!) 1827 | 102 |! 1825 | 123 |! 1822 | 142 
23. The — Lge of arranging these inclinations for use 
and exhibition in a diagram is to divide the 180° into suita- 
ble equal etme. and count the number of comets in eac 
div pst Another method seemed, however, — suited to 
resent pw. and as it is believed to be well adapted to 
many sin similar hetesaionh: I describe it as briefly as possible. 
Each orbit is represented by the area of a probability curve of 
