IV BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Petrography of the Pacific Islands [abstract and discussion] ; 

 by R. A. Daly 48 



Some factors which affect the deposition of calcium carbonate 

 [abstract] ; by John Johnson 49 



Specific weight of drill cores [abstract] ; by Alfred O. Lane. 49 



Chemical and mineralogical composition of meteorites [ab- 

 stract and discussion] ; by George P. Merrill 50 



Importance of water as a magmatic constituent [abstract and 

 discussion] ; by George W. Morey 50 



"Pele's tears" and their bearing on the origin of australites 

 [complete paper and discussion] ; by Elwood S. Moore 51 



Triassic igneous rocks in the vicinity of Gettysburg, Pennsyl- 

 vania [abstract] ; by George W. Stose and J. A^olney Lewis 55 



Desert regolith and its genetic relations to maximum epirotic 

 deposition [abstract] ; by Charles Keyes 57 



Origin of foliation in the Precambrian rocks of northern New 

 York [abstract and discussion] ; by William J. Miller... 57 

 Landslides in unconsolidated sediments [abstract] ; by 



David H. Newland 58 



Annual dinner 60 



Session of Wednesday, December 29 60 



Report of Auditing Committee 60 



Titles and abstracts of papers presented before the morning ses- 

 sion and discussions thereon 60 



Ferrous iron content and magnetic properties of the natural 

 oxides of iron as an index to their origin and history [ab- 

 stract] ; by R. B. Sosman and J. C. Hostetter 60 



Variable composition of melanochalcite [abstract] ; by W. F. 

 Hunt and E. H. Kraus 61 



Definition and determination of the mineral hydroxides of 

 iron [abstract] ; by H. E. Merwin and Eugen Posnjak... 61 



Saline fumarole deposits of the south Italian volcanoes [ab- 

 stract] ; by Henry S. Washington 61 



Crystals and crystal forces [abstract] ; by F. E. Wright... . 62 



Extension of the Montana phosphate deposits northward into 

 Canada [abstract and discussion] ; by Frank D. Adams 

 and William J. Dick 62 



Emerald deposits of Muzo, Colombia [abstract] ; by Joseph E. 

 Pogue 63 



Crystalline marbles of Alabama [abstract] ; by William F. 

 Prouty 63 



Oriskany iron ore [abstract] : by R. J. Holdex 64 



Geologic map of the Fort Hall Indian reservation [abstract] ; 

 by George R. Mansfield 64 



Preliminary geologic map of the Wayan quadrangle, Idaho- 

 Wyoming [abstract] ; by George R. Mansfield 65 



Glacial lakes and other glacial features of the central Adiron- 

 dacks [abstract] ; by Harold L. Alling 65 



