  - Algebraic formulÆ, 73.
- American astronomers, Holden, Pickering, Young, Swift, Comstock, Barnard, Wilson, drew the more conspicuous canals, 65.
- Ancient irrigation, 115.
- Ants surviving at high altitudes, 157;
- unique intelligence, 156.
- Astronomer's chief work, 74;
- Astronomers who have seen the canals, 83.
- Astronomical subjects remote from Martian studies, 72.
- Atmosphere and moisture, Barnard and others, 134, 135;
- Austria's care of water, 117.
- Ball, Sir Robert, difficulties of observation, 84;
- life on Mars quite likely, 68, 69;
- objection to Mars being inhabited, 121.
- Barbour, W. D., with a four inch achromatic, 88.
- Barnard's, Dr., description of dark regions, 43.
- Bees, wasps, and ants, 156.
- Canali supposed to mean canals, 39.
- Canals appear double, 41;
- artificiality of, 42;
- as distinct as engraved lines, 59;
- chain of reasoning in regard to, 47;
- double, 41;
- of Mars, 40;
- unchangeable in position, 42.
- Cassini, 33.
- Chandler's oscillation of pole, 126.
- Checkerboard appearance of West, 48.
- Clerke's, Agnes M., expressions, 55.
- 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, 129.
- Study of planetary markings, 70.
- Sun and planets reduced to minute scale, 11.
- Temperature under which man exists, 149.
- Terby, Dr., identifies many canals, 64.
- Theories regarding canals, 100.
- Thollon, brief sketch of, 178.
- Titles of papers in astronomical journals, 71.
- Todd, Professor, says canals result of design, 68.
- Turner, H. H., "Astronomical Discovery," 78;
- on the difficulties of seeing, 91.
- Tycho Brahe, 8.
- Tyndall on imagination, 77.
- Tyndall's expressions on the Nebular Theory, 15;
- reference to Nebular Theory, 24.
- Unfolding of plant life on the earth, 45.
- Variation in drawings by different observers, 94, 95;
- of Milky Way, 95;
- of Nebula of Orion, 95;
- of Solar Corona, 95, 96.
- Variety of conditions under which life exists, 147.
- Vastness of the universe, 10.
- Wallace, Alfred Russel, human paradox, 29;
- review of, in London "Nature," 18.
- Water vapor, no spectroscopic proof of, Campbell, 135.
- Webb's, Rev. T. W., difficulties of seeing, 91, 92.
- What the Martians might say of us, 166.
- White spots in equatorial regions of Mars, 48.
- White weed in New England, 49.
- Williams, A. Stanley, difficulty in observation, 82.
- Would the work of man show in Mars? 122.
- Young, C. A., on snow caps, 76, 126;
- on Schiaparelli's discovery, 183.
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