Vi CONTENTS. 



Page. 

 XIV, Self-filling Syphon for Chemical Analysis ; by William 

 B. Rogers, Prof, of Chem. and Nat. Phil, in William 

 and Mary College, ... - 302 



XV. Some properties of a Rampant Arch ; by Thomas Gor- 

 ton, Civil Engineer, . - - - 303 

 XVI. A live Snake suspended by Spiders, - - 307 

 XVII. Description of an Instrument for exhibiting a certain op- 

 tical deception ; by Prof. E. S. Snell, - , - 310 

 XVIIL Reply to "Observations on the Treatise of Mineralogy 

 of Mr. C. U. Shepard, by Prof. Andres Del Rio ;" by 

 Charles U. Shepard, - - - - 312 

 XIX. On the Falls of Niagara and the reasonings of some au- 

 thors respecting them ; by Henry D. Rogers, F.G.S. 

 Lond. &LC. ----- 326 

 XX. Meteoric Observations made on and about the 13th of 

 November, 1834 ; by A. D. Bache, Prof. Nat. Philos. 

 and Chem. Univ. Penn. - - - - 335 

 XXI. Meteors on the morning of November 13th, 1834; by 



Alexander C. Twining, Civil Engineer, - 339 



XXII. Lowell— Geological Facts, - - - 340 



XXIII. Notice of the Transactions of the Geological Society of 



Pennsylvania, Part I. - . - - 347 



XXIV. Notice of the discovery of the remains of the Iguanodon 



in the Lower Green Sand Formation of the South East 

 of England. Communicated for this Journal, by Gideon 

 Mantell, Esq. F. R. S. LL. D., &c. &c., of Brighton, 

 England, ------ 355 



XXV. Microlite, a New Mineral Species ; by C. U. Shepard, 



Lecturer on Natural History in Yale College, - 361 



XXVI. On the Strontianite of Schoharie, (N. Y.) with a Notice 

 of the Limestone Cavern in the same place; by Charles 

 U. Shepard, Lect. on Nat. Hist, in Yale College, 363 



miscellanies. — domestic and foreign. 



1. Observations on the Genus Unio, &c. ... 371 



2. Dr. Morton's Synopsis of the Organic Remains of the Cre- 



taceous Group of the United States, - - - 377 



3. Large mass of native copper, - - . - 381 



4. 5. Great Mass of Meteoric Iron from Louisiana — Soapstone 



or Steatite of Middlefield, - - - - 382 



6. Prof. Hitchcock's Geology of Massachusetts, - - 383 



7. The Asclepias Syriaca or Milk Weed a substitute for flax, &c. 384 



