Konig.J 47-<i pjune 17, 



magnetism, or strengtli of a pole ; magnetic potential ; electrokinetic mo- 

 mentum of a circuit ; electric current. 



if. Atomic energy, or energy of unit volume, can be compared with 



Earth's photodynamic energy of unit volume, 7x7^2 = t t^ ' ^'^^'^ with 

 corresponding electric energies, through the equations 



[i«] = [§i] = [«tm] = r2. 



The bracketed symbols represent, respectively, electric displacement 

 (measured by surface-density) ; electromotive force at a point ; magnetic 

 induction ; magnetic force ; current electric intensity at a point ; vector 

 potential of electric current. 



jj. Electrochemical and electromagnetic energies may be compared with 

 thermal, photodynamic and other energies, through the proportion 



X : [x :: MjJ' X ]^W ■ ^aV X m.V,'' 

 I designate Weber's units of electrochemical and electromagnetic force 

 by X and p., respectively; t^ is the time of acquiring orbital velocity, or 

 incipient associative energy, at Laplace's limit of equal velocities of rota- 

 lion and revolution; t„ is the time of acquiring nucleal nascent or dissocia- 

 tive velocity. 



^„ : /„ :: 1 : TT 



d. Total magnetic force, 0^, can be compared with the reactions of ter- 

 restrial magnetic force, ^3, by the proportion 



J, i 



The reactions of orbital tendency Sbret^M^^, tn^is^, respectively; cen- 

 tripetal acceleration varying as the fourth power of orbital velocity, we 

 have the ratio, M„^ : 71*%^. 



{Contributions from the University of Pennsylvania, No. 16.) 



On AlasJcaite, a neio member from the series of Bismuth SulpJwsalts. By 

 Professor George A. Kbnig. 



{Read before the American Philosophical Society, June 17, ISSl.) 



Mode of occurrence. The high mountain mass of south-western Colorado 

 culminates in Mt. Snetfels at an altitude of 14,156 feet. But this great 

 height does not impress itself upon the observer since the deepest valleys 

 are still 7000 feet above the sea. The geological structure of these moun- 

 tains is very simple as a whole; but the energetic action of the forces of 

 erosion, has produced a very rich and picturesquely carved topography, 

 there being no table mountains, but only steep peaks and sharply indented 

 crests. Mineral veins in clearly defined outcrops intersect these moun- 



