﻿10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



Returned from this expedition. Dr. Abbot, finding various critical 

 papers published during his absence tending to express the view that 

 solar variation is still doubtful, devised a new proof of it depending 

 on a simple inspection, on selected days, of the pyrheliometric meas- 

 urements of total solar radiation. By choosing for comparison only 

 days of equal atmospheric transparency and humidity, the uncer- 

 tainties which critics had stressed were largely eliminated. This new 

 treatment supported closely the more elaborate and continuous in- 

 dications of solar variation obtained by the complex process of 

 spectrum analysis. 



In figures 8 and 9 the new and old work is compared for separate 

 months on Mount Wilson and Mount Montezuma, and the parallel 

 variation of sun-spot numbers is also shown. 



Having found from this new study, as well as from previous work 

 at Mount Harqua Hala in Arizona, a source of error due to the 

 Ijright rays of sky light immediately about the sun for very hazy 

 days, an improvement of the silver disk pyrheliometer consisting of 

 a very long vestibule has been made, designed to greatly limit the 

 sky rays admitted to the field of view of the instrument. 



In the frontispiece, figure i, Field Director A. F. Moore is shown 

 observing with the improved instrument at the new solar station on 

 Table Mountain, California, luiilt with the generous aid of Mr. John A. 

 Roebling, and first occupied in October, 1925. 



SMITHSONIAN-CHRYSLER EXPEDITION TO AFRICA 

 TO COLLECT LIVING ANIMALS 



The Smithsonian-Chrysler Expedition to collect living animals 

 for the National Zoological Park sailed from New York on March 20 

 and arrived in Dar-es-Salaam, Tanganyika Territory, East Africa, 

 on May 5. The expedition was financed by Mr. Walter P. Chrysler. 

 Tanganyika was chosen as being one of the best localities in which 

 to make a representative collection of the game animals of East 

 Africa. 



The party consisted of four members: D'r. W. M. Mann, Director 

 of the Zoological Park and leader of the expedition ; Mr. Stephen 

 Haweis, artist and amateur naturalist; Mr. F. G. Carnochan, of 

 New York City; and Mr. Arthur Loveridge, of the Museum of 

 Comparative Zoology at Cambridge. The latter, having previously re- 

 sided eight years at Tanganyika, some of which had been spent in 

 the Game Department there, was conversant with conditions in 

 the country, and in addition, had a good knowledge of Kiswahili 

 language. The Pathe Review sent with the party Mr. Charlton, 



