188.5.1 "^^^ [Blasius. 



For the loss of 4.3 per cent in this analysis I can at present not account. 

 Iron and copper eliminate themselves as chalcopyrite and pyrite ; remain 



210 = 0.0930 



206.4 = 0.2216)0 3878 

 215.3 = 0.0462/ 

 32 = 0.4180 

 R : Bi : S = 3.09 : 1 : 4.5 

 that is 6.18 (PbAgs) S + BIS^ = Beegerite. 



The original beegerite, crystallized, from Clear Creek county, Colorado, 

 contains no silver at all. Apparently this interesting species, only exist- 

 ing in one specimen heretofore, is not rare at the new locality, and may 

 be procurable to collectors. 



I reserve a more satisfactory examination to the future. 

 University of Pennsylvania, Jan., ISS4. 



The Remarkahle Sun-glows in the Falls of 1SS3 and IS84. 

 By Wm. Blasius. 



[ (Read before the American Philosophical Society, January 16, 1SS5). 



There has been much speculation by scientists as to the true explanation 

 of those extraordinary sun-glows that astonished the world in November 

 of 1883, and reappeared in a somewhat lesser degree at about the same 

 time in 1884. In the attempt to explain the brilliancy of this phenome- 

 non, some few meteorologists started on that philosophical principle, that 

 it differs from the usual sun-rises and sun-sets only in degree, and not in 

 kind, and that an explanation must be found in the same laws that govern 

 the ordinary phenomena, i. e., in the refraction of the sun's rays in the 

 stratum of moist air that surrounds the earth's surface. 



These views found their difficulty in the fact that the atmosphere during 

 the time the extraordinary phenomenon took place was comparatively 

 dry, at any rate, that its moisture did not appear to reach to an altitude 

 sufficiently elevated, to cause the glows to extend to that extraordinary 

 height that they appeared to reach. 



To overcome this difficulty, some meteorologists brought the mysterious 

 cyclone into play. The cyclone whirls, so they say, the moist air to an 

 elevation sufficiently high to account for the phenomenon. If the position 

 of the cyclone were such as to allow the sun's rays to pass, in its highest 

 region, through only one side of it ; the highest portion of the sun-glows 

 might find a satisfactory explanation ; but as it would be difficult for the 

 sun's rays to pass through both sides of the cyclone, the lower portion of 

 the sun-glows seems to be left unaccounted for. 



When meteorologists failed to satisfactorily solve the problem, the 

 astronomers took the case in hand, and looked for an adequate cause ex- 



