140 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 138, NO. 7 
ciated with the multiple levels representing each P, D, or F term and com- 
posite doublets and triplets containing so-called satellites are explained by 
changes of plus one, minus one, or zero in the inner quantum number. The 
same theory attempts to account for a new type of regularity shown by 
groups of lines called ‘“‘multiplets’” which have recently been found in the 
complicated spectra of manganese, chromium, and molybdenum. In the 
are spectrum of manganese, for example, groups of 9, 13, or 15 lines are 
apparently explained by changes in inner quantum numbers assigned to 
3P, 5D, and 7F levels when the 9, 13, and 15 line multiplets represent inter- 
combinations of PD, DD’, and DF terms respectively. In its present state, 
however, the theory is unable to predict the exact character or location of 
regularities in unclassified spectra. 
The Pick and Hammer Club met on Saturday evening, February 24, in 
the Director’s room of the Geological Survey. The Foreign situation of 
petroleum was discussed by E. Dr Gotysr, and the Domestic situation of 
petroleum, by G. B. RicHarpson. 
A party of observers from the U. 8. Coast and Geodetic Survey is at work 
in southern California to determine the distance between Mount Wilson and 
San Antonio Peak. The distance between these two peaks is about 20 miles, 
and a base approximately parallel to the line joining them and having a 
length of approximately 20 miles has been located in the valley or plains 
just to the south of the two peaks. The work involved in this project con- 
sists of observations for triangulation and trionometric leveling, the measure- 
ment of the base line with an accuracy not less than one part in a million, 
the determination of the deflection of the vertical in both the meridian and 
the prime vertical, and some precise leveling. Each section of the base will 
be measured at least four times with different tapes in order to secure this 
high degree of accuracy. 
The Division of Physical Anthropology, U. S. National Museum, has 
received casts of the two recently discovered ancient Obercassel skulls with 
parts of the skeletons. The Museum has now very nearly a complete set 
of casts of early human remains, and with one or two exceptions they are 
all first-hand casts made directly from the originals, which enhances their 
value. 
Miss Ftorencre Bascom, Professor of Geology at Bryn Mawr College, 
is spending the winter months in Washington completing her work for the 
U.S. Geological Survey. 
Mr. 8. R. Carrs has returned from private geologic work abroad to duty 
as geologist in the U. 8. Geological Survey. 
Mr. E. T. Hancock, formerly geologist on the U. 58. Geological Survey, 
now employed by the Standard Oil Company in Roumania, visited Washing- 
ton in the latter part of February. 
Mr. F. E. Marrues of the U. 8. Geological Survey gave an illustrated 
address on March 5 before the New York Academy of Sciences on the sub- 
ject of The evolution of the Yosemite Valley. He also spent a day at the Ameri- 
can Museum of Natural History inspecting the new large relief model of 
