188L] ' ^^* [Chase. 



electrokinetic momentum of a circuit by electric current, mass by the 

 square of the velocity of light. The last product is, therefore, precisely the 

 same as m^v^, in the foregoing note, and it furnishes further grounds for 

 considering the primitive oscillations as luminous, rather than electric. 

 There are as good reasons for assuming Earth's mass as the fundamental 

 electric value of M, as for assuming the velocity of light as the correspond- 

 ing value of -Fp, and this assumption brings electric and thermal phenom- 

 ena into simpler and more intelligible relations. The anticipations of my 

 first paper* upon the relations of electricity and magnetism to gravitation 

 are thus very fully and satisfactorily confirmed. 



82. Chemical Units. 



The influence of electric and thermodynamic laws on chemical phenom- 

 ena has long been recognized. There are tTvo special applications of 

 electric dimension to which I would call attention, on account of their 

 apparent bearing upon spectral harmonies and combining equivalents. 



I. The second set of electrostatic, magnetic and electrokinetic pairs 

 gives the following equations : 



[i «] = [i i] = [fit m = [jIJ. 



The symbols denote, respectively, the products of electric displacement 

 by electromotive force at a point, magnetic induction by magnetic force, 

 intensity of electric current at a point by vector potential of electric cur- 

 rents, and the dimensions of energy referred to unit of volume. The last 

 member of the equation also represents the unit of density, or atomic 

 weight of an element, and thus opens a wide field for investigation, both 

 in chemical and in general physics. 



II. Weber found, by experiment, that the unit of electro-chemical force 

 is to that of electromagnetic force as 106§ is to 1. Designating the electro- 

 chemical unit by y and the electromagnetic unit by fi, if we suppose them 

 to vary inversely as the squares of the reacting velocities (Note 80), we 

 find 



it)' ■■(."t)---'^-^ ■■■■"''■'''■■'■ 



This diflfers from Weber's experimental value by less than h of one per 

 cent. The ^r-factor designates the ratio between the time of acquiring at- 

 mospheric orbital velocity at Laplace's limit, t , and the time of acquiring 

 nucleal dissociative velocity, t^ ; 



t^ : t^ : : 1 : TZ. 



83. Positive and Negative. 



The oppositions of solar and Jovian photodynamic reaction, which are 

 shown in the first proportion of No. 80, may perhaps help towards a better 

 * Proc. Am. Phil. Soc, ix., 355-60; April 1, 1864. 



PKOC. AMER. PHILOS. SOC. SIX. 109. 8g. FEINTED JULT 25, 1881. 



