— 477 — 



Davison: Analyses of Kamacite, Taenite and Plessite froni the Weiland 

 Meteoric Iron. 



August 1891. No. 248. — J. D. Dana: Some of the features of non 

 volcanic Igneous Ejections, as illustratecl in the four ,,R° c ks :i of the New 

 Häven Region, West Rock , Pine Rock, Mill Rock and East Rock (Taf. 

 II — VII). — R. T. Hill: Notes on a Reconaissance of the Ouachita Moun- 

 tain System in Indian Territory. — G. H. Stone : Note on the Asphaltum of 

 Utah and Colorado. — W. Harvey Weed : A Gold-bearing Hot Spring 

 Deposit. — Appendix: 0. C. Marsh: Restoration of Stegosaurus. 



September 1891. No. 249. — Frank Leverett: Pleistocene Fluvial 

 Planes of Western Pennsylvania. — F. A. Gooch and H. W. Grüener : 

 A method for the Determination of Antimony and its condition of Oxi- 

 dation. — J. A. Gooch and C. G. Smith : A method for the Estimation 

 •of Chlorates. — J. P. Kimball : Genesis of Iron Ores by Isomorphous and 

 Pseudomorphous Replacement of Limestone etc. — F. W. Clarke and 

 E. A. Schneider: Constitution of certain Micas, Vermiculites and Chlo- 

 rites. — ■ R. D. Salisbury : A further Note on the age of the Orange Sands. 

 — Appendix: XXVI. 0. C. Marsh. Notice of new Vertebrate Fossil. 



16) Proceedings of the American Philosophical Society. 

 Philadelphia. [Jb. 1891. II. -219-.] 



Vol. XXIX. Jan.— Jun. 1891. No. 135. — J. P. Lesley : On an Im- 

 portant Boring trough 200 feet of Trias, in Eastern Pennsylvania. — 

 O. C. S. Carter and J. P. Lesley : Artesian Wells in Montgomery county, 

 at Norristown, Washington Square, Worcester Township, Flourtown, Wil- 

 liams Station, King of Prussia ; Parkesburg, ehester County ; Radnor, De- 

 laware County and Philadelphia. — 0. C. S. Carter: Feldspar Bed in 

 Laurentian (?) Gneiss. 



17) Proceedings of the Academy of Natural Sciences of 

 Philadelphia. 8°. Philadelphia. [Jb. 1891. II. -218-.] 



1891. Part I. Jan.— March. — J. Ryder: An attempt to illustrate 

 some of the primary laws of Mechanical Evolution. — A. Heilprin : Rate 

 of Coral Growth. — E. Goldsmith: Basanite from Crawford County, In- 

 diana. — Ch. Earle : On Palaesyops and Allied Genera. — Ph. Rand : 

 The Sandstone of Chester Valley, Pennsylv. — H. Dall: On the Age of 

 the Peace of Bipalium. — H. F. Osborne : A review of the cretaceous 

 Mammalia. — A. Heilprin: Geol. researches in Yucatan. — A. Brown: 

 On the Young of Baculites compressus Say. 



Berichtigungen. 



In dem Referat über die Abhandlung von E. Artini: „Sulla Le- 

 adhillite di Sardegna" in dies. Jahrb. 1891. II. -31- habe ich das 

 Zwillingsgesetz nicht richtig angegeben: Zwillingsebene ist weder 

 ooP3 (310), wie man früher geglaubt hat, noch ooP (110), wie es im Re- 



ee ** 



