CONTENTS Vll 



Page 

 Hot springs of Lassen National Park [abstract] ; by A. L. 



Day and E. T. Allen 141 



Recent eruption of Lassen Peak [abstract] ; by A. L. Day 



and E. T. Allen 141 



Surface fusion of lava ; by J. S. Diller 142 



A source of heat in volcanic activity [abstract and discus- 

 sion] ; by Leason H. Adams 144 



Use of foraminifera in determining underground structure, 

 especially in petroleum mining [abstract] ; by J. A. Cush- 



MAN 145 



Session of Friday afternoon 140 



Titles and abstracts of papers presented at the afternoon session 

 and discussions thereon 14<j 



Deccan traps and other plateau basalts [abstract] ; by Henry 

 S. Washington 146 



Geology of the Guilford, Connecticut, quadrangle [abstract 

 and discussion] ; by Wilbur G. Foye 147 



Jasperoid of the Joplin district, Missouri, Kansas, and Okla- 

 homa [abstract] ; by W. S. Tangier Smith 147 



Transitional coals and their bearing on hypothesis of the 

 origin of coals [abstract] ; by Edward C. Jeffrey 148 



Organization of Pennsylvania anthracite and the peat hy- 

 pothesis of the origin of coal [abstract and discussion] ; by 

 Edward C. Jeffrey 149 



Ore deposits of Leadville, Colorado [abstract] ; by G. F. 

 Loughlin 149 



Antimony mines of Shiu Chow, China [abstract] ; by George 

 D. Hubbard 149 



Source of the sulphates in the Salina beds [abstract] ; by 

 David H. Newland 150 



Flooding of oil wells by fresh water [abstract] ; by Thomas 

 C. Brown 151 



Sectional session of Friday afternoon 151 



Titles and abstracts of papers presented at the afternoon session 

 and discussions thereon 151 



Oriskany of Oklahoma [abstract and discussion] ; by Charles 

 Schuchert 151 



Age of the Talladega phyllite [abstract] ; by William F. 

 Pr,outy 151 



Constitution of the Ohio black shales [abstract and discus- 

 sion] ; by George H. Chadwick 152 



Volcanic ash bed in the Ordovician of Tennessee, Kentucky, 

 and Alabama [abstract and discussion] ; by Wilbur A. 

 Nelson 152 



Strata near Stuart, Iowa [abstract] ; by John L. Tllton 153 



Environment of the early Permian insects of Kansas [ab- 

 stract and discussion] ; by Cajil O. Dunbar 153 



