Mat 17, 1907] 



SCIENCE 



763 



of depth of ice plucking and of age of 

 decayed sheet. (2) Faults at Manhattan; 

 ordinary effects and evidences; system of 

 probable faults in this region ; fault blocks 

 on each side of the Hudson gorge. (3) 

 Causes of early divergence of Hudson 

 River into Hackensack Valley, two ob- 

 stacles; early drainage system over Meso- 

 zoic terrane, Manhattan River ; later drain- 

 age system over the Manhattan region, 

 creeks in fault valleys ; successive advances 

 of the Hudson into series of preglacial 

 channel gorges through and around Man- 

 hattan Island. 



Professor Julien's paper was discussed 

 by Professors Hobbs and Davis. 



Geologic Map of North America: Bailey 



Willis. 



Exhibition and description of the map 

 compiled in 1906 for the tenth Interna- 

 tional Geological Congress. 



Professor Willis's paper was discussed 

 by Professors Davis and F. D. Adams. 



The Geologic Folio: William Herbert 



Hobbs. 



A discussion of the advantages and dis- 

 advantages of the geologic folio as a me- 

 dium for publication of geologic data. 



Professor Hobbs 's paper was discussed 

 by Dr. Walcott. 



Geological Map of Massachusetts atid 

 Rhode Island: B. K. Emerson. 

 The map is on the scale of four inches 

 to the mile, presenting with considerable 

 detail the latest results reached in the study 

 of the geology of these states. The author 

 has had access to most of the material gath- 

 ered by others in the parts of the territory 

 not covered by his own special studies. 



Professor Emerson's paper was read by 

 title only, but the map was displayed in 

 the Academy of Science exhibition in the 

 museum. 



The Cobalt, Ont., Silver Area: Willet G. 



Miller. 



At the Philadelphia meeting of this so- 

 ciety two years ago, the writer presented 

 a short paper on the geology of the Temis- 

 kaming cobalt-silver area. Since that time 

 the ore deposits of the area have attracted 

 wide attention, not only from the unique 

 character, on this continent, of the ores, but 

 also from their great richness. The present 

 paper contains further details concerning 

 the character and relationship of the veins, 

 and of the rocks. It was illustrated by 

 lantern views, by a model of the more pro- 

 ductive part of the area, and by a recently 

 completed map on the scale of 400 feet to 

 an inch with contour intervals of ten feet. 



Professor Miller's paper was discussed 

 by Professors Emmons, Bell and Buckley. 



Virginia Barite Deposits: Thomas Leon- 

 ard Watson. Read by title. 



Geology of Santa Barbara and Summer- 

 land Oil Field, California: Ralph Ar- 

 nold. No abstract received. 

 Professor Arnold's paper was discussed 



by Professors Bell and Martin. 



Personal Reminiscences of Sir William E. 

 Logan: Robert Bell. Read by title. 



Memorial of A.B. C. Selwyn: H. M. Aml 

 Selwyn was a geologist who attained dis- 

 tinction for his work in Great Britain, Aus- 

 tralia and British America. In 1845 he 

 began his researches in England and Wales, 

 in 1853 was appointed director of the Geo- 

 logical Survey of Victoria, Australia, and 

 in 1869 succeeded Sir William E. Logan as 

 director of the -Geological Survey of Can- 

 ada. Volcanic rocks and their relations to 

 the earlier sedimentary formations formed 

 the principal object of his energies in these 

 three portions of the empire, whilst he did 

 much to emphasize the economic relations 

 of these groups to pure geological investi- 



