APPENDIX 5. 
REPORT ON THE ASTROPHYSICxiL OBSERVATORY. 
Sir : The Astrophysical Observatory was conducted under the fol- 
lowing passage of the sundry civil act approved July 1, 1918 : 
Astrophysical Observatory : For maintenance of Astrophiysical Observatory, 
under the direction of the Smithsonian Institution, including assistants, pur- 
chase of necessary books and periodicals, apparatus, making necessary obser- 
vations in high altitudes, repairs and alterations of buildings, and miscel- 
laneous expenses, $13,000. 
The observatory occupies a number of frame structures within an 
inclosure of about 16,000 square feet south of the Smithsonian ad- 
ministration building at Washington, and also a cement observing 
station and frame cottage for observers on a plot of 10,000 square 
feet leased from the Carnegie Solar Observatory, on Mount Wilson, 
Calif. 
The present value of the buildings and equipment is estimated at 
$50,000. This estimate contemplates the cost required to replace the 
outfit for the purpose of the investigations. 
WORK OF THE YEAR. 
At Washington. — As usual, the computation of the results of solar 
constant observations made at Mount Wilson, Calif., has gone on 
steadily at Washington, except as interrupted by the furlough of 
the computer, Miss Graves, for work in France, as mentioned under 
the subheading " Personnel." After the services of other computers 
had been obtained the work went on rapidly and is now nearly up 
to date. 
The preparation of Volume IV of the Annals of the Astrophysical 
Observatory, including results of measurements from the year 1913, 
has been occupying the attention of the director to a very great 
extent since February. 
In consideration of the fact that the total eclipse of the sun of 
May 29, 1919, was visible in La Paz, Bolivia, which is not very far 
from the Smithsonian solar-constant observing station in Calama, 
Chile, and in further consideration of the fact that the Argentine 
Government is using the daily telegraphic reports of the solar obser- 
vations at Calama for forecasting purposes; and, further, that cer- 
tain conditions had arisen at Calama which would seem to require 
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