Researches on Solar Physics. 187 
Result of Taste Ila. —continued. 
Right of central jine. 
Within 30° _ central ae 30° and 60° 
lin = limb, 
e penumbra o ee 
Within ak om right 
The pen = the | 
po ve left side | pe a vig side of a sek 
Fe prem we on the 
a spot 
Fo ly equal to anity, 
being pas o unity, 
eyed that on = _— is starved that « yet ‘the right is” dures that pe bef ati 
equa ual to 
91 | = wend 13 | 100 
&. Givi ed the percentage of cases, out of 580 observations in all, which are in con- 
Sormity with the assumption, that the umbra is nearer to the center of the sun than 
the aacaaie, and of cases which are against i 
Left of central line. 
beiscront from leit Between 30° and 60° from Within 30° from central 
im | leftglimb. | line. 
__ Again: or. Against. rT. 
ee a cent. _No, |Per Per ‘cent, No. "No. |Per cent _No. Per cent. cent. “No. Per cent. No, \Percent, 
jo | 77 | 99 | 900 | 11 | 100 | 65! 861 | 9 | 13-9 
Right of central line. 
Within 30° a central Between 30° and 60° froin Within 30° from right 
line right limb. limb. 
For. Against. For. | Against. oF. ___ Against, 
_No. (Per cent "No. (Percent | No. |Percent.| No. |Percent.| No. el cent.| No. 
46 | 742 | 16 | 253 | 65 | 797 | 14 | 203 | 82 | 864 | 14 | 146 
The whole number of cases observed is 605; excluding here- 
from 75, where the penumbra is equal on both sides, there re- 
main 580, of which 456, or 86-04 per cent are /or, and 7 74, or 
13:96 per cent are against the assumption. 
Result of Tasre Il, 
Showing the effect of foreshortening in the direction above and below the Equator. 
Above the equator. we Below the equator, 
The lower part of | r part of a 
the fovembra af | Against || ‘the the penumbra of For Against 
each spot bein: icaeioe | aeeeipeton h spot be assumption. | assumption. 
1 lequal to saity, t ee 
Neontas wie uall Novof) 1 of| Per Ie. wed Per [lower part is equal] a pone pa poo 
le cases. | cent, icase cent. asen. | cont cases.) conte 
154 is eel 6 ieee ra 80 | 782) 11 | 268 
The whole number of cases considered is 89, of which 72, - 
80°9 per cent, are for, and 17, or 19-1 per cent, against the 
sumption, that the umbra is nearer to the center of the sun shal 
the penumbra. 
In table ily, since the relative disposition of Bem: and peek 
umbra is estimated in directions parallel to circles of solar 
en only spots having a higher solar latitude have been con- 
It will be seen that the results of tables m, and ey are deci- 
dedly in favor of Wilson’s hypothesis. 
