252 



Mr. C. Chambers. 



for each point being' reckoned =1000," which table contains in all 

 1,225 numbers. A second table is formed from this by taking the 

 mean of twelve successive numbers and moving onward a step (i.e., 

 by one number) after each operation : a third table is formed from the 

 second by taking means of pairs of successive numbers : the third 

 table contains 1,213 entries, or six less at the beginning and six less at 

 the end than the first table : the numbers in the third table — called 

 " three-monthly values " — will be made use of further on, in the 

 inquiry into planetary variations. Next all the numbers in the third 

 table, except those opposite to the divisions (0) of the several months, 

 being rejected, the means are taken of sets of three of the 304 remain- 

 ing numbers, selected in the following manner, viz.: — the means of the 

 1st, 4th, and 7th entries, of the 2nd, 5th, and 8th entries, and so on, the 

 result being placed opposite the middle number of the three in each 

 case. Finally, means are taken of pairs of the successive numbers 

 thus found, the final means being called " nine-monthly values," and 

 corresponding in time to the division (2) of the several months. 

 These final means are shown in Table II, in which the entries are 

 reduced to 297. 



Table II. — Declination-Range, Mne-monthly Values. 



Year. 



January (2). 



February (2). 



March (2). 



April (2). 



May (2). 



June (2). 



July (2). 



Augusc (2). 



September (2). 



October (2). 



November (2). 



December (2). 



1847 























1153 



1168 



1848 



1176 



1170 



1166 



1160 



1144 



1130 



1123 



1122 



1134 



1160 



1182 



1181 



1849 



1171 



1165 



1161 



1155 



1141 



1118 



1089 



1061 



1052 



1053 



1041 



1035 



1850 



1036 



1043 



1050 



1047 



1048 



1038 



1018 



1017 



1017 



1003 



981 



963 



1851 



956 



957 



959 



958 



958 



957 



957 



963 



978 



1000 



1006 



1013 



1852 



1028 



1031 



1031 



1034 



1027 



1015 



1010 



1010 



1001 



984 



977 



973 



1853 



974 



995 



1016 



1020 



1013 



1008 



1013 



1019 



1022 



1015 



997 



976 



1854 



957 



945 



938 



927 



910 



892 



884 



883 



873 



862 



857 



860 



1855 



865 



863 



859 



855 



857 



866 



876 



887 



891 



882 



878 



878 



1856 



869 



853 



842 



836 



822 



806 



809 



817 



821 



824 



819 



815 



1857 



815 



815 



819 



823 



833 



844 



863 



905 



935 



953 



983 



1010 



1858 



1025 



1025 



1036 



1047 



1041 



1044 



1043 



1033 



1039 



1056 



1083 



1114 



1859 



1141 



1153 



1151 



1169 



1193 



1200 



1207 



1202 



1179 



1159 



1159 



1167 



1860 



1161 



1157 



1172 



1181 



1187 



1189 



1175 



1152 



1134 



1122 



1109 



1079 



1861 



1047 



1028 



1027 



1045 



1062 



1065 



1060 



1050 



1048 



1045 



1039 



1025 



1862 



1003 



993 



992 



990 



988 



984 



980 



977 



976 



975 



965 



957 



1863 



959 



961 



960 



953 



937 



926 



928 



927 



918 



911 



906 



900 



1864 



908 



927 



934 



932 



933 



933 



927 



929 



943 



942 



927 



922 



1865 



918 



914 



916 



910 



896 



892 



898 



905 



914 



922 



929 



926 



1866 



919 



906 



872 



838 



821 



818 



821 



821 



825 



829 



834 



850 



1867 



864 



867 



856 



833 



812 



807 



819 



822 



806 



797 



801 



813 



1868 



830 



843 



842 



839 



854 



874 



888 



892 



887 



883 



891 



910 



1869 



929 



949 



977 



998 



1009 



1014 



1020 



1033 



1042 



1047 



1051 



1054 



1870 



1065 



1094 



1130 



1163 



1189 



1219 



1230 



1216 



1207 



1204 



1200 



1191 



1871 



1181 



1169 



1152 



1151 



1162 



1170 



1164 



1140 



1134 



1145 



1148 



1147 



1872 



1146 



1140 



1135 



1140 



1160 



1166 



1148 













The numbers in the table are curved (in a strong line) in fig. 1, 

 and the comparable numbers obtained by Dr. Stewart* for Kew and 



* " Proc. Eoy. Soc," vol. 26, p. 109, and vol. 28, p. 84. 



