. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. \\ \ Fig. 1. Fig. 2. FiGS. 1 AND 2. By Percival Lowell, in Mars and Its Canals, pp. 126, Fig. 3. Fig. 4. Figs. 3 and 4. By William H. Pickering, in Popular Astronomy, Jan., 1918. PLATE V. Drawings of Mars. The Solar System 23 Uranus and Neptune as abodes of life: we do not see how theycan have anything in the nature of solid surfaces. Venus andMars are the planets most nearly equal in size to the has a very lig
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. \\ \ Fig. 1. Fig. 2. FiGS. 1 AND 2. By Percival Lowell, in Mars and Its Canals, pp. 126, Fig. 3. Fig. 4. Figs. 3 and 4. By William H. Pickering, in Popular Astronomy, Jan., 1918. PLATE V. Drawings of Mars. The Solar System 23 Uranus and Neptune as abodes of life: we do not see how theycan have anything in the nature of solid surfaces. Venus andMars are the planets most nearly equal in size to the has a very light atmosphere, certainly, but we knownothing as to the extent of Venuss atmosphere, except that ithas one. If Schiaparelli was right in his conclusion that theplanet Venus always presents the same face to the Sun, as itprobably does, then life on Venus would be difficult: one hemi-sphere would have eternal day with burning temperatures, andthe other hemisphere eternal night with extreme cold. Marsand the Earth seem to have many resemblances. Seasonalchanges occur in the aspect of Mars such as could reasonably beattributed to changes in vegetation ; and if there is vegetable lifethere could well be, and probably is, animal life. However, thevegetable may b
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