January 18, 1895.] 



SCIENCE. 



G3 



Aliout tlie Siimc time the lu.niu section 

 also adjourned for luueh, wliich was most 

 hospitably served to the \asiting societies 

 ill the Johns Hopkins gj-mnasium. High 

 praise is due the local committee for the ex- 

 cellent arrangements. After lunch the so- 

 ciety' reconvened and the first paper was : 



23. Notes on the Glaciation of Newfound- 

 land. By T. C. Chambeklin. 



Tlie paper brought out the very interest- 

 ing facts that the glaciation of Newfound- 

 land is local and that the moraines and 

 sti'ite show that it proceeded fi-om the cen- 

 ter of the i.sland to the coast. The drift is 

 all peripheral and can be easily ti-aced to its 

 sources. 



24. The Pre-Camhrian Floor of the North- 

 tvestvrn States. By C. W. Hall. (Read 

 in the absence of the author by Warken 

 Upham.) 



The paper pointed out the distribution of 

 the Pre-Cambrian areas in the territory 

 under investigation so far as it is known at 

 the present time. It then showed by means 

 of records of deep and artesian well bor- 

 ings, within reasonable limits of probability, 

 the depth of the Pre-Cambrian rocks over 

 a considerable area bej-ond the surface area 

 outlined. 



Maps and a series of profiles accompanied 

 the paper. 



The paper was tUscussed bj- G. K. Gil- 

 bert, who called attention to the importance 

 of the results. 

 2.5. A Further Contribution to Our Knowl- 



nf the Laurentian. Feank D. Adams, 



Montreal, Canada. 



After referring briefly to the author's pre- 

 vious work- on the aiiorthosite inti'usions of 

 the Laurentian, the paper gave a condensed 

 account of the results of a studj' of the 

 stratigi-apliical relations and petrogi-aphical 

 character of the gneisses and associated 

 rocks of the Oren\'ille series in that portion 

 of the protaxis which lies to the north of 

 the Island of Montreal. By means of lan- 



tern slides Dr. Adams gave a very grapliic 

 account of the region in question. Some 

 thin sections of rocks as large as an ordi- 

 nary lantern slide were used to illusti-ate 

 the passage of a massive rock into a cruslied 

 and sheared or gneissoid form. The paper 

 formed not onlj' an important contriljution 

 to the geology of the region, but to our 

 knowledge of dynamic metamorphism as 

 well. Discussion was reserved until after 

 the reading of the next two. 

 26. The Crystalline Limestones, Ophiolites, 

 and Associated Schists of the Eastern 

 Adirondacks. J. F. Kemp, New York. 

 After a brief inti-oduction and sketch of 

 what others had done on the subject in 

 hand, the areas of these rocks, especially in 

 Essex county, were outlined and described 

 •with geological sections. It was shown 

 that they are generally small, usually less 

 than a square mile ; that they consist of 

 (a) white graphitic crystalline limestone, 

 ■\\'ith gTcat numbers of inclusions of sili- 

 cates, (b) of ophiolites, (c) of black garneti- 

 ferous hornblende schists, (d) of lighter 

 quartz scliists, and (c) in one area, of closely 

 involved granulite very like the Saxon 

 gi-anulite. The evidence of the plasticity 

 of limestone under pressure was grapliicallj' 

 shown by lantern .slides. The trap dikes 

 that often cut the limestones were referred 

 to, and the relations with the intrusive gab- 

 bros were set forth, and the argument 

 made that the limestones are older than 

 the gabbros and auorthosites of the Norian 

 series, and that they are the remnants of 

 an extended formation which was cut up by 

 these intrusions, inetamorphosed largely by 

 them and afterward eroded. A comparison 

 was drawn with those on the western side 

 of the mountains. 



2T. The Relations of the Grtjstalline Lime- 

 stones, Gneisses and Anorthosites in St. 

 Lawrence and JeJ/'erson Counties, N. Y. 

 C. H. Smyth, Jk., Clinton, N. Y. 

 The paper dealt especially with areas in 



