Part 17

Phillips', Rev. Theo. E. R., drawing, 62.

Pickering, W. H., canals seen by, 63; shows importance of steady atmosphere, 87; observations in Jamaica by, 88; polariscope observations by, 36-38; theory of, 105.

Planetology, 77.

Plurality of worlds, astronomer's belief in, 18; Edward Hitchcock's views of the, 21; Flammarion's views of the, 19; Newcomb's attitude in regard to the, 28; Newcomb's belief in the, 29; O. M. Mitchell's views in regard to the, 19; Sir David Brewster's views of the, 17; Sir Richard Owen's views in regard to the, 19; Tyndall's views of the, 22.

Polar snow cap, proof deduced from Lowell, Douglass, and Pickering, 135.

Profound changes by man, 123.

Railroads in Iowa and Texas, 142.

Review of Lowell's book, 66.

Rift in Southern Africa, 112.

Schiaparelli, abstemiousness when observing, 84; brief sketch of, 172; canals artificial, 62; canali natural, 60; discovery, 57; discovery of canals, 39; does not deny intelligence in Mars, 60; suggestion as to doubling, 120.

Sea, so-called, land areas, 39.

Seasonal changes, 136.

Snow storms in Mars, W. H. Pickering, 138.

Solar system a standard for universe, 26.

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.