652 
LOWELL—MARS ON 
SouTH CAP. 
Days before 
summer 
solstice. 
1862 48 
1877 34 
1890 63 
55 
48 
35 
1804 89 
Size. 
36° Lord Rosse 
29° Schiaparelli 
30° 66 
25° 
25° 
20° gs 
50° Lowell Obsy. 
Days before 
summer solstice. 
92-80 
80-70 
70-60 
60-50 
50-40 
40-30 
SoutTi Cap. 
Mean. 
50° 
39 
34 
28 
25 
27 
GLACIAL 
EPOCHS. [Noy. 16, 
NorTH Cap. 
Days before 
SUMMLEYr 
solstice. S22. 
1882 82 20° Schiaparelli 
Ai] 27° 
1884 84 30° 
76 28° 
65 25° “ 
55 25° 
46 220 
35 25° 
1886 = 85 30° 
55 21° " 
32 12° (mean) 
1897 43 22° Lowell Obsy, 
39 18° 
1899 92 40° Flammarion & 
Antoniadi 
77 35° 
75 36° 
58 33° 
41 30° 
NorTH Cap. 
Mean. 
30° 
32 
25 
26 
25 
18 
From this it appears that from ninety-two days to thirty days be- 
fore their respective summer solstices the southern cap is continu- 
Furthermore, that it exceeds 
the latter most the farther away it is from the solstice. From 
which we may conclude that at its maximum it also surpassed the 
ously larger than the northern one. 
latter. 
Any correction for irradiation would but increase the contrast, 
since the north polar cap is necessarily observed from a much 
