1872.] on Planetary Influence upon Solar Activity. 215 



Table II. 



Longi- 

 tude. 



-63 

 -49 

 -35 

 -21 

 - 7 

 + 7 

 +21 

 +35 

 + 49 

 +63 



Sum of areas corrected for earth-effect. 



- (A) 

 ^enus= Earth + 0°. 



48905 

 48385 

 47508 

 46203 

 45026 

 43603 

 44134 

 45306 

 46476 

 48742 



464288 



+54 

 +42 

 +23 

 - 4 

 -30 

 -61 

 -49 

 -25 



+ 1 



+49 



10000 



(B) (C) 

 Venus = Earth+90°. Venus = Earth + 180°. 



60573 

 59869 

 60210 

 59847 

 58493 

 56496 

 54867 

 54184 

 54782 

 54473 



573794 



+56 

 +43 

 +49 

 +43 

 +20 

 -15 

 -44 

 -55 

 -46 

 -51 



10000 



44031 

 44075 

 43606 

 43974 

 45084 

 47446 

 47768 

 46821 

 43693 

 40875 



447373 



IOOO 



-16 

 -15 

 -25 

 -17 

 + 7 

 +61 

 +68 

 +47 

 -23 

 -87 



10000 



(D) 



Venus=Earth+270° 



27776 

 28881 

 30023 

 31331 

 32711 

 33791 

 34547 

 35068 

 36285 

 37143 



327556 



IOOO 



-152 

 -118 



- 84 



- 44 



- 1 

 + 31 

 + 55 

 + 71 

 + 107 

 + 135 



10000 



7. We may do the same for the planet Mercury as we have done for 

 Venus, that is to say, we may split up the whole body of observations into 

 four parts, representing the behaviour of sun-spots when Mercury is in the 

 same four positions with respect to the Earth as those which are given for 

 Venus in the above Table. Only in this case we must bear in mind that, 

 owing to the eccentricity of Mercury's orbit, this planet will sometimes take 

 a longer, and sometimes a shorter time to go from one configuration to 

 another. Thus, for instance, we have 



Mercury = Earth + 0° on March 24, 1854 ; 



Mercury=Earth+ 90° on May 6, 1854 ; 

 and Mercury = Earth + 180° on May 29, 1854. 

 We should therefore take the observations between April 15, 1854, and 

 May 18, 1854, as representing the behaviour of sun-spots due to a position 

 of Mercury 90° before the Earth, and so on for other cases. The following 

 Table has been constructed on this principle, and it may be regarded as ex- 

 hibiting for Mercury precisely what the above Table exhibited for Venus : — 



Table III. 



jLongi- 

 tude. 



Sum of areas corrected for earth-sffect. 



(A) 



Mercury = Earth +0°. 



(B) 



Mercury = Earth+90° 



(C) 



Mercury = Earth+ 180°. 



(D) 



Mercury = Earth+ 270 c 



-63 

 -49 

 -35 

 -21 

 - 7 

 + 7 

 +21 

 +35 

 4 49 

 +63 



45298 

 45492 

 45978 

 43870 

 42568 

 42384 

 42885 

 44270 

 45780 

 44922 



443447 



+22 

 +26 

 +36 

 -11 

 -40 

 -44 

 -33 

 - 2 

 +32 

 + 14 



45555 

 44183 

 41723 

 41398 

 41386 

 41096 

 41460 

 40649 

 40337 

 42157 



10000 



419944 



IOOO 



+85 

 + 52 

 - 7 

 -14 

 -15 

 -21 

 -13 

 -31 

 -39 

 + 3 



39034 

 40288 

 42303 

 44554 

 45266 

 45502 

 44817 

 42740 

 41478 

 40122 



10000 



426104 



IOCO 



-84 

 -54 

 - 8 

 +46 

 +62 

 +68 

 +52 

 + 3 

 -27 

 -58 



50409 

 49868 

 48996 

 48453 

 48817 

 49844 

 51341 

 53000 

 51772 

 51562 



10000 



50406: 



IOOO 



+ 



-10 

 -28 

 -39 

 -31 

 -11 

 +18 

 +51 

 +27 

 +23 



10000 



