Clouds in Mars, 139; in Mars, Sir Norman Lockyer, 136. Comments and criticism, 125. Committee of British Astronomical Association, 126. Conception of life in other worlds, 17. Conservatism of astronomers, 185. Cracks all of the same nature, 108; discontinuous, 109; in asphalt pavement, 109. Cultivation under cloth, Porto Rico, 50. Dark regions not seas, 45. Dawes, remarkable distinctness of vision, 89. De la Rive, memoir of Faraday, 76. Denning's, Mr., testimony, 56, 57. Difficulties of seeing, 79. Dighton Rock, 97. Draper, Dr. Henry, "Are other worlds inhabited?" 87; difficulties of seeing, 87; high altitudes for telescopes, 88. Drawings of Mars by different observers, 98. Dust storms in Mars, 140. Earth, a standard, 25, 26, 186; early ideas regarding the, 7; improbability of its being unique, 13. Earth's distance from the sun, 11; temperature above normal, 37. Emerson's expressions, 21. England's unsteady atmosphere, 84. Epicyclic theory of Ptolemy, 8. "Evolution of the Solar System," T. J. J. See, 23. Failure of water in England, 116. Faraday's, Michael, attitude, 76. Fauth, Dr. Phil., 63; drawings of Mars, 63. First look at Mars, 80. Fison's, Mr., comments, 97. Flammarion's picture of the Earth from Mars, 169; work on Mars, 51. Fruit trees, Santa Clara Valley, 49. Gill's, Sir David, testimony, 90. Hebraic conceptions, astronomers imbued with, 21. Hebraic conceptions of the universe, 8. Herschel, Sir John, on snow caps, 76. High altitudes favorable to health, 152. Holden, E. S., on nebula of Orion, 96. Howe's, Herbert A., remarks, 65, 66. Huxley's estimate of mathematicians, 74. Huyghens, 32. Ice caps of Himalaya, 115. Iles, George, illustration of cooling bodies, 25. Illusions, supposes, 59. Irrelevant criticism, 126. Irrigation, ancient in Arizona, in Egypt, in India, 145; marvels of, 143; notes on, 141. Joly's, Dr. J., theory, 100. Keeler's definition of astrophysics, 77. Lampland, photographs of Mars, 32. Ledger's, Rev. E., canals of Mars, 131. Liberal attitude of naturalists, 185. Life at high altitudes, 150; in other worlds, Garrett P. Serviss, 148; under atmospheric pressure, 153. Lindsay's, Thomas, expressions, 55. Lines of artificial character, 112. Lockyer, Sir Norman, saw clouds in Mars, 136. Lockyer's, W. J., testimony, 89. Lowell, Percival, brief sketch of, 174; different telescopes used by, 82; gives reason why canals cannot always be seen, 93; his acute eyesight, 85, 86; his book on Mars, 31; his various publications, 31; long practice in observing, 85; snow caps prove atmosphere, 135; on life on Mars, 32, 67; on twilight atmosphere in Mars, 34. Lung capacity, 155; at high altitudes, 152. Macpherson, Hector, Jr., agrees with Lowell, 68.