86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 03 
In October, Dr. Michelson left for Kansas to investigate the Sauk 
and ox of the Missouri and adjacent tribes. A preliminary survey 
was all that was attempted owing to the inclemency of the weather. 
Some myths, obtained among the Foxes of Iowa, were also translated, 
and the investigator returned to Washington for office work. 
Fic. 85.--A Catawba hearth with pottery. Photograph by Michelson. 
PM IPIBID INO) OL IEE, A SINROMED SICAL, CQHESIBIRW IA TORO 
Mr. L. B. Aldrich proceeded to Mount Wilson in July, 1913, for 
the purpose of measuring the solar radiation. He was joined there 
at the end of August by Director Abbot. Several kinds of work were 
undertaken ; first, the usual spectro-bolometric determination of the 
solar constant of radiation. This work has now been carried on dur- 
ing every summer at Mount Wilson from 1905 to 1913 inclusive, ex- 
cepting the year 1907. It has resulted in showing an irregular vari- 
ability of the sun from day to day, and a dependence of the sun's 
radiation on the number of sun-spots. It has also yielded a value ot 
the solar constant of radiation believed to be correct within one per 
cent. Since there have been criticisms of the value, however, on the 
ground that it is impossible to correctly estimate the losses of radia- 
tion in the earth’s atmosphere, it was felt desirable to check the result 
by sending up self-registering apparatus attached to free balloons 
to the highest possible altitudes. 
This work was undertaken by Mr. Aldrich in July in cooperation 
with the United States Weather Bureau. Balloons were sent up on 
five days from Santa Catalina Island, carrying 1n each instance a selt- 
registering pyrheliometer devised and tested at the Smithsonian 
Astrophysical Observatory, and a self-registering apparatus of the 
Weather Bureau, which records the temperature, pressure, and 
humidity of the atmosphere. 
