in atmosphere, [162], [168].

Weather, [66], [89], [95].

Wedge of Casius, [242];

canals in, [247];

oases in, [251], [252], [256].

Welkin, man-manufactured, [13-15].

White spots, [32], [165];

similar in look to polar caps, [73];

location and season of, [74], [76-79], [80], [81];

White spots, permanency of, [73], [76];