anomalous position of, [262].

Quaternary epoch of the Earth, [137].

Reddish-ochre regions, [153], [155];

deserts, [149], [156], [163];

variations of tint in, [32], [148], [149], [151].

Rifts in polar cap, [61-63], [67], [162], [325-329];

permanent in place, [61], [62];

not depressions, [62], [63], [162];

coincide with canals, [326-328];

explanation of, [328], [329].