; TITLES AND ABSTRACTS OF PAPERS 127 



III. Dynamo-static metamorphism (load metamorphism in rocks lying 

 beneath overthrust blocks). 

 B. Local metamorphism (caused by eruptive bodies). 



I. Contact metamorphism (magmatic influence in control). 

 II. Load-contact metamorphism (combination of magmatic influences, 

 the earth's body heat, and dead weight stress). 



This table and the corresponding definitions are offered for discussion and 

 improvement. 



Presented in abstract extemporaneoiisl}^ 

 Brief remarks were made by Prof. C. K. Leith. 



STUDY OF THE REGENT ACTIVITY OF MAUN A LOA 

 BY ARTHUR L. DAY 



{Ahstract) 



The conditions surrounding the violent summit eruption of December and 

 January, 1914 and 1915, and the accompanying lava flow within the summit 

 crater were described, together with some discussion of the dynamic relations 

 involved. At this summit eruption the volume of gas was enormous, the 

 temperature very high, and the lava of unusual texture. Following this, 

 an outbreak of gas took place in May, 1916, on the mountain side near the 

 10,000-foot level. The explosions were of great violence, but little or no lava 

 was ejected. Toward the close of the month an outpouring of lava took place 

 on the same side of the mountain, but at the 7,000-foot level, in which two 

 streams emerged from the radial rift zone, each flowing about 8 miles. This 

 eruption was characterized by wholly different physical features, with much 

 lava, little gas, and low temperature. 



Presented in abstract extemporaneously. 



At 12.15 o'clock the reading of the regular scientific papers was dis- 

 continued, and a public address was given in Chancellor's Hall on 

 "Geology and Public Service/' by Hon. George Otis Smith, Director of 

 the United States Geological Survey. 



At the conclusion of this address the Society was adjourned, to recon- 

 vene at 2 o'clock. 



The Society was called to order at 2 o'clock, with President CUarke 

 presiding and Doctor Berkey acting as secretar}^, and took up first tlie 

 matter of the Branner geological map of Brazil, presented by the Council. 

 It was explained in behalf of the Council that a complete geological map 

 of Brazil has been prepared by Doctor Branner and is offered to the 

 Society for publication. The issuing of such a map involves much greater 

 expense than is usual for a contribution in regular series, and the Council 



