A DIAGRAM OF A STREAM OF METEORS SHOWING THE EARTH PASSING
THROUGH THEM 32
COMET, SEPTEMBER 29, 1908 33
Photo: Royal Observatory, Greenwich.
COMET, OCTOBER 3, 1908 33
Photo: Royal Observatory, Greenwich.
TYPICAL SPECTRA 36
Photo: Harvard College Observatory.
A NEBULAR REGION SOUTH OF ZETA ORIONIS 37
Photo: Mount Wilson Observatory.
STAR CLUSTER IN HERCULES 37
Photo: Astrophysical Observatory, Victoria, British Columbia.
THE GREAT NEBULA IN ORION 40
Photo: Yerkes Observatory.
GIANT SPIRAL NEBULA, MARCH 23, 1914 41
Photo: Lick Observatory.
A SPIRAL NEBULA SEEN EDGE-ON 44
Photo: Mount Wilson Observatory.
100-INCH TELESCOPE, MOUNT WILSON 45
Photo: H. J. Shepstone.