216 Messrs. Warren De La Rue, Stewart, and Loewy [Mar. 14, 



8. The following is a Table constructed on a precisely similar principle 

 with reference to the planet Jupiter : — 



Table IV. 



Sum of areas corrected for earth-effect. 



Longi- 

 tude. 



(A) 



Jupiter = Earth+0°. 



(B) 



Jupiter = Earth + 90°. 



(O) 



Jupiter = Earth+180°. 



CD) 



Jupiter = Earth+270°. 







IOOO 





IOOO 





IOOO 





IOOO 







-63 



29348 



- 34 



35369 



-20 



48871 



-25 



42794 



+39 



-49 



28665 



- 57 



35256 



-24 



50118 



- 1 



43163 



+48 



-35 



28836 



- 51 



35176 



-25 



51432 



+26 



40747 



-11 



-21 



28623 



- 57 



34962 



-32 



51029 



+18 



41318 



+ 3 



- 7 



28779 



- 53 



35739 



- 9 



51116 



+20 



40500 



-17 



+ 7 



30321 



- 1 



36494 



+11 



50560 



+ 9 



40599 



-15 



+21 



31309 



+ 31 



37264 



+32 



50266 



+ 3 



40979 



- 5 



+35 



31488 



+ 36 



36935 



+24 



50489 



+ 7 



41579 



+ 9 



+49 



32400 



+ 67 



36584 



+ 13 



49558 



-11 



40876 



- 7 



+63 



31017 



+119 



37147 



+30 



47792 



-46 



39373 



-44 





303786 



10000 



360926 



10000 



501231 



10000 



411928 



10000 



9. If we now examine the two Tables for the planets Venus and Mercury, 

 we shall find in them indications of a behaviour of sun-spots appearing to 

 have reference to the positions of these planets, and which seems to be of 

 the same nature for both. This behaviour may be characterized as follows : 

 — the average size of a spot would appear to attain its maximum on that 

 side of the sun which is turned away from Venus or from Mercury, and to 

 have its minimum in the neighbourhood of Venus or of Mercury. 



10. The apparent behaviour is so decided with regard to Venus, that the 

 whole body of observations will bear to be split up into two parts, namely 

 Carrington's series and the Kew series, in each of which it is distinctly 

 manifest. The following treatment will serve to render this effect more 

 visible to the eye. 



In Table II., column (A) (Venus = Earth + 0°), we have ten final num- 

 bers denoting the behaviour of a spot of average area =1000 at ten central 

 longitudes as follows : +54 + 42 + 23—4—30 — 61—49 — 25 + 1+49. 



Let us take the mean of the first and second of these, the mean of the 

 second and third, and so on, and we get the following nine numbers : — 



+ 48 + 32+10-17-45-55-37-12 + 25. 



Performing the same operation once more, we obtain the following eight 

 numbers, corresponding to the eight central longitudes : — 



+ 40 + 21 -3-31-50—46-25+7. 



In the following Table we have exhibited the results obtained by this 

 process : — 



