- H. A. Hazen—The Sun Glows. 5 Se 
tose color was left. Thus the morning appearances differ from 
those in the evening, in that they show distinctly this double 
phenomenon. The two are identical to the observer and th 
second can be seen even in a perfectly cloudless day. : 
Seventh. Faint stars and clusters, notably Preesepe, have been 
easily seen even near the horizon. On Januar 27, in the mor- 
ning, while the sky appeared covered by several distinct layers 3 
of cloud directly above the sun, yet it was possible to easily 
find Antares shining through the haze till twenty minutes before 
sunrise, ae 
Seeking nowa probable cause for the glow, it is suggested that 
at least three conditions are necessary to show the best results. — 
rst. The sky must be clear or nearly so. 
Second. There must be an abundance of reflecting, diffracting 
or absorbing material, as is shown by the well nigh world-wide 
appearances, 
rd. There must be some force to carry the material to a 
great height or sustain it for a long time against the action of 
gravity. The lateness of the hour after sunset at which the 
atter-glow disappears indicates that the material may be at a 
great height, and the fact of the later long continuance of the 
phenomenon shows that some force must be acting to keep up 
the particles, 
vapor is universally and somewhat uniformly distributed — 
the earth's surface, and has always been found in great abun 
-'ozen moisture or frost particles at high altitudes, the follow- 
Mg experience of the writer may be of interest: 
~» 8e. 15, 1883, an ascent of Graylock, in sn mie rae 
Was undertaken. This peak rises almost abruptly 2, ‘ The 
above a plain which is itself 780 feet above sea level. a 
Stmmit was reached at 7.80, and here a severe gale, ens 
Ps Ly miles per hour, was experienced. The temperature w 
; air m , ‘ a 
_ “apor, the wet bulb, after most careful mani ulations, alt ; 
about half a degree higher than the dry. | hile there seem 
ely particles, was plain from the beautiful ap 
and shrubs which made it seem as if one had stepped | 
