_Lucus Ismenius_, 19, 258; only double oasis, 259; association with canals, 260, 261.
_Mare Acidalium_, 115, 242, 246-252; white in, 80; darker than the Mare Erythraeum, 127.
_Mare Erythraeum_, 113; irregular lines in, 30; in 1903, 122-124; in 1905, 124-126.
Maria, on the moon, 109, 111; not seas, 112, 113; on Mars, 110; not seas, 117; southern hemisphere, 31.
Mesozoic times of the earth, 135, 142, 144, 151.
Monera, 349, 357; suggestive of crystals, 356.
Months, Martian, different from our own, 36.
Mountains, not visible on Mars, 100; measurement of, 97-100; limit of height visible, 100; on Moon, 98, 99.
_Naarmalcha_, association with Luci Ismenii, 260, 261.
_Nilokeras_, double, 209; photographed, 225.
North America, geologic history of, 133-137.
Oases, detected later than canals, 30, 249; three stages in appearance of, 250-252; number of, 252; kinds of, 252-254, 263; shape of, 253, 371; position of, 254-257, 263; connected with canals, 256, 257, 262, 371; disprove diplopic theory, 258; objectivity of, 263; in dark regions, 163, 244, 263, 264; kinematic character of, 330-333; latitudinal progress of change in oases, 331; evolution of, 331, 332; intrinsic change in, 337, 338; at junction of canals only, 255, 371.
Observations, mutual corroboration of, 165, 166; among mountains, 7.
Phenological quickening, on Earth, 342; on Mars, 343.
_Phison_, 221, 231, 249, 258, 266, 267, 316; continuously double, 213; connection with Euphrates and Portus Sigaeus, 218, 219.
Physiographic conditions, on Mars, 68, 128.
Polar caps, phenomena of, 37, 41, 61; key to comprehension of planet, 37; compared with those of earth, 41, 46; composition of, 39, 161, 168, 339; making of new, 94; position of, 68; aspect of, 56, 57; maxima and minima of, 38, 41-44, 47-53, 55-57, 66-68, 162; fission of, 61.
Polar seas (see Blue band); fresh water, 162.
_Portus Sigaeus_, nicks in the coastline, 207, 266, 267; embouchure to Phison and Euphrates, 218.
Precipitation, 51, 79, 154, 155; effect on glaciation, 52.
Projections on the terminator, 77, 81, 96, 100, 104, 165; color of, 102; cause of, 104-107; great one of 1903, 101-104; of 1900, 104.
_Propontis_, the, 242; canals in, 247; oases in, 256.
_Protonilus_, association with Luci Ismenii, 260.