86 



SCIENCE 



[N. S. Vol. XLII. No. 1072 



CALIFOMNIA MEETING OF TEE GEOLOG- 

 ICAL SOCIETY OF AMERICA 



The business sessions of the summer meet- 

 ing of the society are to be held as planned at 

 the University of California and Leland Stan- 

 ford Junior University, August 3—5, 1915, in 

 affiliation "with the American Association for 

 the Advancement of Science. 



The sessions of Tuesday and Wednesday, 

 August 3 and 4, will be held at the University 

 of California and that of Thursday, August 5, 

 will be held at Stanford University. Morn- 

 ing sessions at Berkeley will begin at 10 

 o'clock ; Stanford University, at 10 :30 o'clock. 

 Afternoon sessions open at 2 o'clock. Train 

 leaves San Francisco 9 a.m., arriving Palo 

 Alto at 9 :54. 



The society's subscription dinner will be 

 held at the Engineers Club, San Francisco, at 

 Y o'clock on the evening of Wednesday, August 

 4. The price is $1.50 jjer plate. Early notice 

 of intention to participate in the dinner should 

 be sent to the secretary of the Cordilleran 

 Section, Mr. J. A. Taff, 781 Flood Building, 

 San Francisco. 



Excursions, August 6, to Point Eeyes Sta- 

 tion, Marin County, for an examination of the 

 San Andreas earthquake rift and to Mussel 

 Bock, San Mateo County, for an examination 

 of Pliocene strata, the type section of Merced 

 formation and the post-Tertiary deformation 

 of the coast. 



August 7 to Santa Cruz for an examination 

 of uplifted marine terraces. 



August 9 and 10 (with the Paleontological 

 Society) to Mount Diablo for an examination 

 of the Mount Diablo overthrust and the suc- 

 cession of Tertiary strata and to Walnut 

 Creek. 



August 11 and following days, to Tosemite 

 with F. E. Matthes and E. C. Calkins. 



The Shattuck Hotel at Berkeley has been 

 selected for the hotel headquarters where rooms 

 may be had from $1.50 up. Reservations 

 should be made in advance. For a complete 

 list of hotels with rates see Science, Vol. XLL, 

 No. 1068, June 18, 1915, page 893. 



Information regarding railroad routes and 

 rates from the east may be gathered from 



Science, Vol. XLL, No. 1069, June 25, 1915, 

 page 935. 



The principal features of the program are 

 the following syinposia: 



On Erosion and Deposition in Arid Climates, led 

 by H. E. Gregory. 



On DiastropMsm of the Pacific Coast, led by An- 

 drew C. Lawson. 



On Petrological Problems of the Pacific Area, led 

 by R. A. Daly. 



On Seismology of the Pacific Coast Region. 



On Ore Deposits, led by C. P. Tolman. 



The first four will be held at the University 

 of California and the last at Leland Stanford 

 Junior University. The afternoon session of 

 Wednesday will be devoted to seismology. 



The following titles have been submitted 

 thus far, others may be included in the daily 

 program. 



John D. Clark (introduced by C. F. Tolman, Jr.), 

 ' ' The Role of Colloidal Migration in Ore De- 

 posits" (15 minutes). 



William Herbert Hobbs, "Origin of the Basins 

 within the Hamada of the Libyan Desert" (20 

 minutes). 



William Herbert Hobbs, "Limited Effective Ver- 

 tical Range of the Desert Sand-blast, Based upon 

 Observations made in the Libyan Desert and in 

 the Anglo-Egyptian Sudan" (20 minutes). 



J. C. Jones (introduced by J. C. Merriam) "Origin 

 of the Tufas of Lake Lahontan" (20 minutes). 



Andrew C. Lawson, "The Profiles of the Desert" 

 (30 minutes). 



George D. Louderback, "Structural Features of 

 the Tsin Ling Shan" (60 minutes). 



J. C. Ray (introduced by C. F. Tolman, Jr.), "Ex- 

 amples of Successive Replacement of Earlier Sul- 

 phide Minerals by later Sulphides at Butte, Mon- 

 tana" (lantern slides, 15 minutes). 



A. F. Rogers (introduced by C. F. Tolman, Jr.), 

 "Sericite, a Low Temperature Hydrothermal 

 Mineral" (lantern slides, 20 minutes). 



C. F. Tolman, Jr., "Bajadas of the Santa Catalina 

 Mountains, Arizona" (20 minutes). 



C. F. Tolman, Jr., "Chemical Interpretation of 

 Certain Data Furnished by the Microscopic In- 

 vestigation of Ores" (lantern slides, 30 min- 

 utes). 



Harry O. Wood (introduced by A. C. Lawson), 

 "On a Possible Causal Mechanism for Heave 

 Fault-slipping in the California Coast Range Re- 

 gion" (30 minutes). 



