298 
Rel. Humidity, Max., 96.5° on the 15th, Min., 16-4 on the 
5th, Range, 80:1. 
Prevailing wind, N. W. 14:3 days mean, Rain, 4°79 inches, 
7 days rain, 2 days snow, 1 day sleet. 
Aurora Borealis on the 9th, grandly beautiful. 
Lunar corona on the 22d, bright. 
Lunar halo on the 23d, large, a slight haze. 
The mean temperature for Noy., 1871, was higher than 
during the ten years preceding. 
December 4th, 1872. 
Pror. T. Eaieston, Vice-President, in the chair. Twenty 
persons present. 
The Corresponding Secretary announced the death of Sir 
Roderick J. Murchison, Honorary Member of the Society. 
Dr. L. FrucHTWANGER exhibited a specimen of Copper 
Pyrites and Plumbago in Gneiss, from Alabama. The Chairman 
announced the discovery of Calomel and Native Mercury in 
Panama. 
Pror. H. Wurtz made some remarks on the Streak of 
Calomel. The streak of native Calomel is white, whilst that 
of artificial Calomel is yellow. 
Dr. I. WALZ made some remarks on the Supposed existence 
of Tin Ores in various parts of the United States. He said that 
he had lately seen specimens which it was claimed established 
the existence of Tin in Utah; but such was not the case. 
THe CHAIRMAN made some remarks on this subject, show- 
ing how often the occurrence of Tin in the United States 
had been falsely reported. 
