AO. 15 



SMITHSONIAN EXPLORATIONS, 1 92 1 



33 



ing cave ; figure 32, the group of buildings comprising the observer's 

 quarters, the shop and the garage; and figure 33 the entrance to the 

 observing cave vi^ith such observing apparatus as is employed outside 

 during observations of the solar constant. 



It is possible to drive the automobile on high gear clear to the 

 observer's quarters which are situated at the head of a canon sheltered 

 on the west by a rise of several hundred feet from the strong west 

 winds of afternoon. There is almost invariably practically complete 





Kir ^ 



^ «^ 



r:i 



% 





■i"^ 

 ^ --<> 



Fig. 33. — Pyranomctcr, coilosiat, pyrheliometers and theodolite with L. H. 

 Abhot, Director at Mount Montezuma. 



absence of wind for several hours after sunrise, a thing highly favor- 

 able to morning work. 



The observing cave near the top of the movmtain is less than 

 10 minutes walk from the observer's quarters. It is only necessary to 

 go up twice a day, once to observe, and again at 8.30 P. M. to signal 

 the observed value to Calama, whence it is telegraphed to Buenos 

 Aires. 



BOTANICAL EXPEDITION TO THE ORIENT 



During the summer and fall, 1921, Dr. A. S. Hitchcock, system- 

 atic agrostologist of the Department of Agriculture and custodian of 

 the section of grasses of the Division of Plants in the U. S. National 



