ILLUSTRATIONS
Reading edition
The Moon. First Quarter Photographed by Loewy and Puiseux, February 13, 1894.Frontispiece
FACING PAGE
Spiral Nebula in Constellation Leo Photographed by Keeler, February 24, 1900.26
Nebula in Andromeda Photographed by Barnard, November 21, 1892.28
The "Dumb-Bell" Nebula Photographed by Keeler, July 31, 1899.34
Star-Field in Constellation Monoceros Photographed by Barnard, February 1, 1894.84
Solar Corona. Total Eclipse Photographed by Campbell, January 22, 1898; Jeur, India.108
Forty-Inch Telescope, Yerkes Observatory170
Yerkes Observatory, University of Chicago176
PRACTICAL TALKS BY AN ASTRONOMER