1877.] Range of Magnetic Declination. 109 



Table IV. — Declination-range, Nine-monthly Values. 





.0.0 

 1 050. 



1859. 



1 8£^ 

 I SOO. 



IdDI. 



,5/:, 

 1 502. 



I803. 



1 504. 



I 0O5. 



I ODD. 



IOO7. 



1505. 



Jan. 



(2) 



... 



I052 



I IO9 



IO3O 



945 



1008 



945 



9O9 



879 



851 



_ _ 



532 



Feb. 



(2) 



... 



IO9O 



III3 



IO29 



942 



IOO9 



942 



9IO 



807 



o^O 



*>37 



Mar. 



(2) 





I085 



1 1 l6 



IO26 



947 



1 006 



934 



9O7 





844 



54O 



April 



(2) 





IO94 



III7 



IO3O 



946 



996 



91 D 



902 



837 



832 



859 



May 



(2) 





IIO5 



I IO9 



IO36 



941 



9 8 3 



895 



898 



829 



820 



876 



June 



(2) 



957 



III2 



IIO4 



IO32 



942 



971 



887 



894 



826 



8ll 



89I 



July 



(2) 



960 



III2 



IO93 



1029 



956 



976 



89O 



89O 



832 



804 



898 



Aug. 



(2) 



962 



II07 



IO75 



I027 



979 



988 



900 



889 



844 



799 



887 



Sept. 



{2) 



975 



IO95 



I063 



IOl6 



1002 



986 



914 



888 



851 



801 



874 



Oct. 



(2) 



997 



IO92 



IO5O 



995 



1013 



974 



921 



888 



854 



807 



878 



Nov. 



(2) 



1030 



IO97 



1040 



975 

 960 



1010 



962 



918 



888 



852 



816 



885 



Dec. 



(2) 



1061 



1 102 



IO34 



1007 



952 



911 



884 



85I 



827 





Table V. — Spotted Areas, Nine-monthly Values. 





1858. 



1859. 



i860. 



1861. 



1862. 



1863. 



1864. 



1865. 



1866. 



1867. 



Jan. (z) 



5°4 



1 1 22 



1311 



1343 



1112 



913 



770 



598 



522 



72 



Feb. (2) 



53° 



1086 



1220 



1400 



"73 



829 



868 



605 



482 



65 



Mar. (2) 



53« 



1107 



1246 



1426 



1249 



745 



943 



574 



438 



55 



April (2) 



595 



1241 



1240 



!359 



1266 



698 



982 



5io 



410 



86 



May (2) 



6 54 



1316 



1244 



1313 



1268 



623 



904 



474 



361 



153 



June (2) 



706 



1361 



1254 



1333 



1285 



560 



803 



4i5 



283 



194 



July (2) 



778 



1446 



1292 



1352 



1249 



5!5 



766 



366 



198 



211 



Aug. (2) 



871 



1462 



1357 



1316 



1271 



528 



760 



398 



144 



234 



Sept. (2) 



983 



1485 



1370 



1265 



1294 



606 



823 



461 



120 



251 



Oct. (2) 



1030 



1532 



1402 



1236 



1231 



671 



830 



5*3 



100 



262 



Nov. (2) 



1051 



i5 6 3 



H37 



1150 



"33 



710 



736 



535 



85 



3°5 



Dec. (2) 



1 100 



1500 



i37» 



1077 



1005 



7i5 



643 



537 



78 





6. If we compare together Tigs. I. and II. (p. 105), it will be seen that 

 there are a good many points in the one curve which we are fairly entitled 

 to identify with corresponding points in the other ; of these, b and i repre- 

 sent the respective maximum and minimum points. There is, however, 

 a fluctuation between d and e on the declination-curve that has no corre- 

 sponding fluctuation on the sun-spot curve ; while, on the other hand, 

 there are a series of small fluctuations on the sun-spot curve between 

 b and c which have no distinct analogues on the declination-curve. It 

 will, however, be seen that both of these discordant regions are repre- 

 sented by dotted lines on the sun-spot curve ; that is to say, they repre- 

 sent results derived either wholly or in part from Schwabe's eye-observa- 

 tions while the Kew photo-heliograph was not in action. 



Again, it will be remarked that each of the corresponding points occurs 

 later in point of time in the declination than in the sun-spot curve. Thus 

 we have : — 



