SOUR TE RIN (GALLHORINGA ACAD EM YAO SCIENCES 77 
OFFICERS OF THE SECTIONS. 
Astronomical. 
Chairman, Wm. H. Knight. 
Secretary, H. O. Collins. 
Biological. 
Chairman, Dr, C. A. Whiting. 
Secretary, Dr. C. H. Phinney. 
Geological. 
Chairman, Geo. W. Parsons. 
Secretary, G. Major Tabor. 
Botanical. 
Dr. A. Davidson. 
Agricultural and Chemical. 
Chairman, Dr. S. M. Woodbridge. 
Standing Committees. 
Publication— Dozier, Davidson, Ulrey. 
Program—Whhiting, Knight, Collins. 
Finance—Keese, Badger, Parsons. 
Chairman, 
TRANSACTIONS 
Astronomical Section. 
The regular meeting of the Astronomical Section was held Monday 
evening, October 15, 1906, at the residence of Prof. Melville Dozier, on 
Kleventh Street. 
Mr. Knight read an interesting paper upon the newly discovered 
planet T. G., which was first detected upon a photograph plate at Kon- 
igstuhl on March 3, 1906, and seen through the refractor at Vienna on 
March 5, 1906, by Palisa. 
Its orbit has a striking similarity with that of Eros, as it lies five 
gears within, and seven gears without the orbit of Jupiter. 
HOLDRIDGE O. COLLINS, Secretary. 
GEHOLOGICAL SECTION: 
The opening meeting of the Geological Section of the Academy of 
Sciences of Southern California was held at the Casa de Rosas Audi- 
torium Girls Collegiate School, Adams and Hoover streets, on Monday, 
Oct. 22 at 8 p.m. An address was given by Professor W. L. Watts, his 
subject being Geological Notes on some portions of Oaxaca, Mexico. He 
described the geological features of the Northern and Central portions 
of Oaxaca, and their bearing on the mineral deposits of the territory 
whieh was the subject of his discourse, 
He said that the portion of the Sierra Madre Oriental ranges which 
he visited in Oaxaca are composed mainly of hydro-miea sehist with 
some ridges wherein the prevailing formation is syenitie granite, both 
the syenitic and schist. are traversed by dykes of intrusive rock, and 
contain veins carrying silver and a little gold. The silver being prin- 
eipally in the form of pyrargarite, i. e., sulphantimonide of silver. 
