Intelligence and Miscellaneous Articles, 393 



" As the liquid area acted upon by the current becomes greater and 

 greater when its distance from the poles increases, and as, conse- 

 quently, the lines of chemical action become longer, it appears pro- 

 bable that these lines of action exercise a repulsive influence upon 

 each other ; so that, on their being forced closer together, an increase 

 of resistance or diminution of electric motion follows. 



" Electrical motion must therefore be of such a nature that two 

 equal and coincident undulations (that is, undulations proceeding 

 from a single pile) travelling close together, must weaken each other 

 reciprocally, perhaps through a transformation of electrical into 

 thermic motion. Further, there must be a certain difference between 

 the various successive motions, as two equal and coincident undula- 

 tions proceeding from two independent piles travel together side by 

 side without the least mutual interference." 



BOILING-POINTS OF ORGANIC BODIES. 



To the Editors of the Philosophical Magazine and Journal. 



Graz in Oesterreich (Steiermark), 



Heinrichstrasse No. 3, 



Gentlemen, August 24, 1871. 



You would oblige me very much by inserting the following notice 



in your Philosophical Magazine. The very interesting treatise of 



Mr. Burden, " Boiling-points of Organic Bodies" (Phil. Mag. June 



1871, Supplementary Number), contains a mistake; for the author 



supposes that the velocity of gas-molecules having the temperature 



of f C. is to be found by multiplying the velocity at 0° C. by 



1+ ly^o' But tn ^ s velocity is really found by multiplying by 



V 



1-| It thence follows that, at the boiling-point of such 



273 



substances as have a constant number in the last column of Mr. 



(273-\-t) 2 

 Burden's Tables, the quotient is constant, but not at all 



the velocity of a molecule. In this formula t signifies the boiling 

 temperature, p the specific gravity of vapours. 



Yours &c, 



Ludwig Beltzmann. 



OBSERVATIONS ON THE COLOUR OF FLUORESCENT SOLUTIONS. BY 

 HENRY MORTON, PH.D., PRESIDENT OF THE STEVENS INSTITUTE 

 OF TECHNOLOGY. 



As the result of a series of experiments to be presently described, 

 I have come to the curious conclusion that all the familiar fluorescent 

 solutions, such as the tincture of turmeric, of agaric, of chlorophyl, 

 and the solution of nitrate of uranium, emit light of the same colour 

 by fluorescence, namely, blue identical with that developed by acid 



