theory supported by rifts in polar cap, [329];

most satisfactory explanation of phenomena of canals, [339], [341], [344],

[345], [347], [348], [373];

two seasons of growth of, [346];

melts snow, [328].

Water, dearth of, [128], [161], [163], [166], [168], [169], [341], [366];

loss of, inevitable, [131];

speed of flow of, [375];

from polar caps, [340], [374].

Water-vapor, from polar caps, [83];