Intelligence and Miscellaneous Articles. 157 



iodide of iron, the remainder being water; this corresponds very 

 nearly with 5 equivalents of water to 1 equivalent of anhydrous 

 iodide of iron ; the deficiency in the experiment of \ grain may, 

 I conceive, be traced to the dissipation of iodine, a very small quan- 

 tity of oxide of iron having been deposited during evaporation, as 

 in the previous experiment. 



Thus iodide of iron is composed of 



1 equivalent of iodine 126 



1 do. iron 28 



5 do. water 45 



199 

 I have not been able to prepare anhydrous iodide of iron ; for 

 when the heat is continued long enough to dissipate the "water, 

 iodine is expelled with it, the residuum being peroxide of iron. 

 I am, Gentlemen, yours respectfully, 

 St. Thomas's Hospital, July 20, 1835. J. D. Smith. 



PARALLEL, BY NEWTON, UPON THE CORPUSCULAR THEORY, TO 

 MR. TALBOT'S EXPLANATION OF CERTAIN PHENOMENA OF 

 INCANDESCENCE UPON THE UNDULATORY THEORY. 



The following was intended to appear as a note to Mr. Talbot's 

 paper, p. 115, but was not prepared in time for insertion in its pro- 

 per place. 



[Sir Humphry Davy, in his Elements of Chemical Philosophy, no- 

 tices, in the following terms, Newton's suggestions towards the ex- 

 planation, upon the corpuscular hypothesis, of certain phenomena 

 nearly related to those above explained by Mr. Talbot upon the un- 

 dulatory theory, of whose views they afford a curious parallel; but 

 in which, we conceive, the superiority of the undulatory theory is 

 very manifest. — " Newton," Sir Humphry Davy says, " has put the 

 query whether light and common matter are not convertible into 

 each other ; and adopting the idea that the phaenomena of sensible 

 heat depend upon vibrations of the particles of bodies, supposes 

 that a certain intensity of vibrations may send off particles into free 

 space, and that particles in rapid motion, in right lines, in losing 

 their own motion, may communicate a vibratory motion to the par- 

 ticles of terrestrial bodies. (Elem. of Chem. Philos., p. 215 — 216. 

 —Edit.] 



SCIENTIFIC ASSOCIATION OF GERMANY: MEETING AT BONN 

 FROM SEPTEMBER 17TH TO 27TH. 



The annual meeting of this body is to be held this year at Bonn 

 on the Rhine, from the 17th to the 27th of September. At the 

 meeting last year at Stuttgart, Dr. Christian Friederich Harless, 

 Privy Councillor of Prussia, and Professor of Medicine in the Uni- 

 versity of Bonn, and Dr. Jacob Noggerath, one of the Directors 

 in Chief of the Council of Mines for the Rhenish Provinces of 

 Prussia, were respectively chosen President and Secretary of the 

 ensuing meeting. 



