482 RECORDS. 



ingly developed, giving 48-sided forms, sometimes with small 

 faces of the rhombic dodecahedron in addition. Zoisite also 

 occurs in fine terminated crystals, and Limonite of remarkable 

 iridescence. 



The second paper, by Dr. Arthur Hollick, was entitled Notes 

 ON THE Glacial Phenomena of Staten Island, and embodied 

 the general results of several years of study and exploration by 

 himself and others. The author outlined the topography of the 

 island and the distribution of drift material upon it, and de- 

 scribed the transported contents of the drift with relation to their 

 sources. Most of the drift material is made up of the Triassic 

 sandstone and shale from the adjacent mainland, ground up by 

 the ice-sheet ; but the boulders are largely brought from afar. 

 They comprise material from all the fossiliferous beds of central 

 New York, from the Potsdam to the Hamilton, but there is a 

 great preponderance of Lower Helderberg and Schoharie grit. 

 The fossils are in many cases finely preserved, have been col- 

 lected in large quantities, very carefully studied and determined. 

 The question as to the route by which they have come, over 

 the hilly and almost mountainous regions lying between their 

 source and their resting place is one of much interest. 



An extended discussion followed the reading of this paper. 

 Mr. van Ingen claimed that the course had probably been down 

 the Mohawk Valley to that of the Hudson and then down the 

 latter, rather than over the highlands of southern New York. 

 Professor Stevenson suggested that the transportation over this 

 long distance may have been due to repeated glacial movements, 

 each transporting over a moderate distance. 



The next paper was by Mr. Francis C. Nicholas, on the 

 Sedimentary Formations of Northern South America, and 

 dealt with 2 }^rgc area of rittfe-expforecf country^ between the 

 Caribbean coast and the Northern Andes. It was illustrated by 

 a most extensive and carefully labeled series of rocks, ores and 

 minerals from many localities and horizons, to which it was im- 

 possible to do justice within the limits of the evening. Among 

 many interesting points described and illustrated with speci- 

 mens was the agency of sun's heat as a rock-disintegrator ; 



