708 PROCEEDINGS OF THE BALTIMORE MEETING 



DETERMINATION OF MINERALS IN CRUSHED FRAGMENTS BY MEANS OF THE 

 POLARIZING MICROSCOPE 



BY A. F. BOGEES 1 



SYNOPSIS OF THE STRATIGRAPHY OF CALIFORNIA 



BY JAMES PEEEIN SMITH 1 



STRUCTURE OF THE CENTRAL PORTION OF THE COAST RANGES OF 



CALIFORNIA 



BY J. F. NEWSOM 



SEDIMENTARY FORMATIONS OF THE COALINGA DISTRICT, CALIFORNIA 

 BY EOBEET ANDEBSON 1 



NEOCENE OF THE UPPER SALINAS VALLEY REGION 

 BY EOBEET MOEAN 1 



RfiSUMfi OF THE GEOLOGY OF BRAZIL 

 BY OEVILLE A. DEEBY 



GEOLOGY OF THE REGION OF DIAMONDS AND CARBONADOS IN BRAZIL 

 BY J. C. BBANNEE 



RECONNAISSANCE ABOUT THE BIG SUR REGION OF THE SANTA LUCIA 



MOUNTAINS 



BY J. CULVEB HAETZELL 1 



PROPOSED FORM OF SEISMOGRAPH INTENDED TO GIVE A DIRECT INDICATION 

 OF THE FORCES IN PLAY* 



BY W. F. DTJEAND 1 



[Abstract] 



(1) The usual forms of seismograph indicate displacement, and if this is 

 recorded on a time axis an analysis of such record may give indications of 

 acceleration and force. 



(2) The instrument suggested is intended to give a more direct indication of 

 acceleration and force. 



(3) In the usual forms an oscillating system of long period (usually some 

 form of pendulum) is provided with a tracing point, while a roll of paper is 

 mounted on the frame-work and is unrolled under such point. When the sys- 

 tem is subjected to a relatively short period disturbance the pendulum remains 



Manuscript received by the Secretary of the Society February 27, 1909. 

 Introduced by J, C, Branner, 



