Prof. Bartlett on Molecular Motions in Poiarized Light. 361 
42. Observations at Key West, Florida, (lat. 24° 33’, long. 81° 48’), by 
, Wituiam C, Dennis. 
Sept. 2d, at 24 4. m. there were two patches of brilliant ruddy 
lights one in the N.E. and the other in the N. - From the 
North extending 15° toward the E. there were ie of light 
full 60°. At 
manner. At 8h 15™ the rays gradually ay eared, but there 
still remained brilliant vadity lights in the N.K. and N.W. At 
34 A.M. the aurora was decidedly fainter, and at 4 A.M. nothing 
but a faint glow remained. This glow did not entirely disappear 
until overcome by the light of day. 
43. Observations at Sea, (lat. 12° 23’ N., long. 88° 28’ W.), by Com- 
mander W. D. Porrsr, U.S. Navy. 
Sept. Ist, about 114 p. wt. thesky had a lurid appearance in the 
north, and there were occasional flashes of lightning. The rest 
of the sky was clear, bright and beautifully blue. The red ap- 
pearance was very much like the aurora of high latitudes, and 
how and then it had a wavy appearance. About1 A. . a bod 
of heavy clouds passed over with rain. 
oe 
wt, XXX11.— On: the’ direction of molecular motions in Plane 
Polarized Light; by Prof. W. H. C. BARtTLert, 
Fresnel’s Formulas for reflecion and ordinary refraction. 
Tules for the resolution and comparison of forces, without any 
hypothesis in regard to the condition of the ether in the co-ter- 
