CONTENTS, V 



Fage. 



VIIL On Water Spouts; by Prof. Hans Christian CErsted, 250 



IX. Brief notice of the extrication of Barium, Strontium 



and Calcium by exposure of their chlorides to a 

 powerful voltaic circuit in contact with mercury as 

 a "cathode;" and the distillation of the resulting 

 amalgams by means rnf vessels of iron, . • 267 



X. Process for a Fulminating Powder— for the Evolution 



of Calcium and Galvanic Ignition of Gunpowder ; 

 by Dr. Hare, . . • . . . . 268 



XL On the Boracic Acid Lagoons of Tuscany ; by John 



BowKiNG, LL. D., 270 



XIL Magneto-Electric Multiplier; by Chas. G.Page, M. D., 275 



277 



XIIL Method of adjusting the Dipping Needle ; by Prof. 



Thomas H. Perry, ••••.. 

 XIV. Results of Experiments on the Vibrations of Pendulums 



with different suspending springs ; being the sub- 

 stance of a paper by W- J. Frodsham, F. R. S,, • 278 

 XV. On Coins and Medals, w^ith a notice of the Medal which 



has been recently struck to commemorate the settle- 

 ment of New Haven, Connecticut, . • - 285 

 XVL Formula for discovering the Weight and Volume in a 



Mixture of tw^o Bases; by Dr. Jno. M- B. Harden, 289 

 XVIL Abstract of a Monograph of the Genus Sciurus, with 



descriptions of several new species and varieties ; 



by J. Bachman, M, D., . • . . . 



XVIII. Catalogue of Botanical Specimens, collected by J. 



290 



i^ 



WoLLE and A. L. Huebener, during the year 1837, 

 in the vicinity of Bethlehem and other parts of 

 Northampton County, Pennsylvania, in the order as 

 they were found in bloom, . , . • . 310 



XIX. Effects of Lightning upon the packet ship New York ; 



by Mr. Charles Rich, . • . . . 



XX. Report on the Shooting Stars of August 9th and 10th, 



1839, with other facts relating to the frequent occur- 

 rence of a meteoric display in August; by Edward 

 C. Herrick, .••••.. 



XXL Description of a New Species of Liatris ; by David 



321 



325 



Thomas, 



(*■ 



338 



XXII. Observations on the New Haven Tornado of July 31, 



1839 ; by Prof- Denison Olmsted, . . . 340 



