84 ANNUAL EEPORT SMITHSONIAN INSTITUTION, 1919. 
a little, but on the day of the eclipse it proved to be a trifle too fast, 
so that the moon appears to be elliptical rather than perfectly round, 
as it should have been, except for the slight motion of the moon rela- 
tive to the sun during the eclipse. However, this defect is not very 
noticeable, and excellent photographs were obtained with both lenses, 
but particularly with the one which was exposed 1 minute and 30 
seconds rather than the other, which was exposed 2f minutes. 
The phenomenon was uncommonly grand, far more so than appears 
in the photograph. The sun had risen over a snow-capped 
mountain, about 20,000 feet high. It rose over half eclipsed, with 
the crescent horns pointing upward from the horizon equally. In 
20 minutes totality occurred, and there shot out over 20 fine sharp 
coronal rays, greatest elongated along the equatorial zone, but also 
visible to great distances from the poles. At the lower limb there 
was a very large flaming red prominence, which at that time rose 
to perhaps a quarter of the solar radius, and had a very long side 
extension, after the manner of a hook. The same prominence was 
observed by spectroscopic methods in the United States, at the great 
observatories, and was one of the finest prominences ever photo- 
graphed. It is very interesting and fortunate that the early history 
of this prominence was enriched by the photograph made at La Paz 
so very early in the morning. 
Taking the whole phenomenon together, the snow-covered moun- 
tain, the brilliant sky at that great altitude of 14,000 feet, the very 
numerous and long coronal streamers, and the enormous crimson 
prominence casting its glow over all, the spectacle was truly glorious, 
and by far the most impressive of any of the eclipses which have been 
seen by the writer. It was reported that the Bolivian natives lighted 
many fires and supplicated the sun to return, after old Inca tradi- 
tions. 
Visit to Argentina. — Immediately after the eclipse Messrs. Moore 
and Abbot proceeded to La Quiaca in Argentina for the purpose of 
having a conference there with the director and forecaster of the 
Argentine meteorological service. Mr. Clayton, the official fore- 
caster, submitted for their inspection results he had obtained during 
several years in the comparison of the weather of Argentina with 
the variations of solar radiation reported by the Smithsonian observ- 
ers at Mount Wilson, Calif., and Calama, Chile, and the results ob- 
tained by using the measurements of Calama for the forecasting of 
the weather in Argentina. 
Mr. Clayton says : 
For nearly a year numerical and graphical analyses have been made of the 
solar variations and of the variations of temperature at 20 selected stations well 
distributed over Argentina, Chile, and Brazil. These analyses show that each 
variation in solar radiation has been followed by similar variations of tern- 
