﻿NO. 2 



SMITHSONIAN EXPLORATIONS, 1 924 



33 



indicating the spectral distribution in the radiation of blue, white, 

 yellow and red stars, and estimates of their probable temperatures 

 were made. From these results and the results giving the total amounts 

 of heat they send compared to the sun, estimates were possible of the 

 diameters of the stars observed. 



A summary of these results follows, in which the diameters he esti- 

 mated are compared with the values found in other ways by Michel- 

 son's interferometry methods, and by Russell from photometry. It is 

 hoped to improve the sensitiveness of the radiometric devices suffi- 

 ciently to make possible a study of much fainter stars. 



Stellar Temperatures, Radiation, and Diameters 



*N = Ratio of stellar to solar radiation outside earth's atmosphere. 



t To express in kilometers, multiply by i.4.;xio''. To express in miles, multiply by 

 0.865x106. 



ZOOLOGICAL EXPLORATIONS IN WESTERN CHINA 



For several years the Rev. David C. Graham, of the West China 

 Mission of the American Baptist Foreign Mission Society, has been 

 collecting natural history material in the vicinity of his station at 

 Suifu, in the province of Szechuen, and sending his specimens to the 

 U. S. National Museum. At times his activities have led him further 

 afield, and last year (1923) he conducted a successful trip to Tatsienhi, 

 a locality several days' journey to the northwest of Suifu. 



Tatsienlu is an important spot for naturalists through being the 

 type locality for many species brought to light by earlier travellers. 

 It was visited by the Abbe Armand David about the year 1869, by 

 Prince Henri d'Orleans in 1890, and by A. E. Pratt in the same year, 

 followed in 1894 by a Russian explorer, G. Potanin. Ernest H. Wilson 



