Autumn, length of Martian, in northern hemisphere, 35, 48; in southern, 35, 48.
Axial tilt, 34, 36, 55, 155, 161; determinations of, 34, 36, 155; determines character of seasons, 34, 36; effect of, on presentation of arctic and antarctic regions, 70; effect of, on temperature of arctic and temperate regions, 88.
Bilateralism, 208; inherent attribute of canals, 209.
Blue band, surrounding polar caps, 39, 40, 42, 43, 56, 61, 63, 71, 161, 162, 168, 338, 339.
Blue-green areas (see Dark Regions), 32, 67, 163; taken for seas, 110.
Camera, the, 272; advantage of, 273; slower than the eye, 273; stars the peculiar province of, 273, 274.
Canals, 11, 32, 163; discovery of, 24, 26; considered straits, 27; regularity of, 28, 29; unnatural in look, 173; manner of introduction of, 174; conditions necessary to seeing of, 174-177, 282, 283; pencil-like lines, 177, 179, 367; definite in direction, 178; name, 180; width of, 179, 180, 182; length of, 183; visible by virtue of length, 181; oddities of, 183; number of, 184; systematic arrangement of, 184, 185, 187-191, 248; connect with polar caps, 325, 339, 373; import of system of, 338, 372, 373; intrinsic change in, 283, 284, 337, 338; what they are not, 185-187, 373; zonal distribution of, 188, 189; departure-points, 190; dependent on general topography, 191; of later origin than main features, 191, 247; kinematic character of, 281-303; effect on, of illumination, 284; drawings of, numerous and consecutive, 286; coördination of data, 288, 289; curves of visibility of (see Cartouches), 289, 290; geometricism of, 175, 206, 365, 367, 368; polar, 327.
Canals in the dark regions, 30, 31, 243-248; of the southern hemisphere, 245; of the northern hemisphere, 246, 247; detection of, 243, 245; deprived seas of marine character, 243; part of canal system, 244, 245, 247.
Carets, 265-270; natural formations, 231, 232; form and position of, 266, 267; reason for shape of, 268; associated with canals, 267, 269; help in solution of riddle, 270; act like oases, 333.
Cartouches of the canals, 289-303; interpretation of, 291-293, 299-303, 344-347; arranged by latitudes, 294; showing first frosts, 299; minimum points of, 297, 344; maximum point of, 301; mean canal, 297, 298.