_Pseboas Lucus_, 207, 250, 253, 263; anomalous position of, 262.
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.
Rotation, early noted, 108, 109; how determined, 34; time of, 34, 160; disclosed by markings, 32-34, 108.
San Francisco Peaks, 18, 19, 149, 379, 380.
Schiaparelli, 11, 15, 21, 23, 24, 26, 27, 29, 30, 31, 34, 68, 74, 75, 81, 114, 115, 120, 121, 173, 177, 186, 192, 212, 217, 221, 247, 249, 265, 282, 313, 314, 325, 337, 367, 373.
Seas (see Dark Regions). southern, 92; formerly on Mars and the Moon, 129; internal absorption of, 147.
Seasonal change, metabolic, 169; in canals, 168, 169, 285, 373.
Seasons, like our own, 34, 35, 166; length of, 48, 79, 161; of vegetal growth, 346, 347.
Silurian era of the Earth, 134, 138, 140.
Sky, blotting out of, 14; measure of extinction of, 16.
Snow, 345; limits of, on Earth and Mars, 108.
S.S. Challenger, concerning south polar cap of earth, 45.
Surface, relatively flat, 62, 76, 97, 164; covered by canal network, 243; clear-cut in good air, 258; in fluid equilibrium, 374; indicative of thin air, 162, 167.
Surface features, reality of, proved, 26, 33.
_Syrtis Major_, 22; first marking made out, 23.
Temperature, 78, 147, 165, 166; effect on life, 358.
Terminator, projections on, 77, 81, 96, 100-107, 114, 165; depressions on, 164.
Terraqueousness, shown by earth, 128, 131.
Terrestriality, follows terraqueousness, 129, 131, 137, 144-146; earth’s oceans contracting in size, 131; inevitably, 131, 146; as shown by Mars and the Moon, 128, 130, 131; as shown by the geologic history of earth, 131-137; as shown by paleontology, 138-144; making a better habitat, 145, 146.
_Thoth-Nepenthes_, peculiar course of, 208; hibernation of, 315-324.
_Trivium Charontis_, canals and oases in, 251, 252, 256.
Vegetation, 79, 119-127, 163, 166, 169, 301; color of Mare Erythraeum, 122-126; proof of, 170; 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.