Stars, bright points of light, 7; similar to our sun, 9. Stetefeldt's, C. A., views, 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. FOOTNOTES: [1] Some of our readers may not know that light travels, in round numbers, at the rate of 186,000 miles a second. [2] The terminator represents the limit of light on that side of the planet in the shade, in other words, where the light terminates. In viewing the Moon, when at quarter or half, the terminator is seen very ragged on account of the illumination of higher points on the surface. If the Moon was as smooth as a billiard ball the terminator would be clear cut. [3] The world in its ignorance of Italian assumed that the word meant exclusively canals, and, if canals, then dug by shovels. What! a canal thirty miles wide and two thousand miles long dug in the snap of the finger? Impossible conception, you say. We shall see later the sober utterances of a member of the British Astronomical Society on this gratuitous assumption, and an equally serious comment by the chief assistant of the Royal Observatory at Greenwich (E. S. M.).