230 
The following paper was read. 
Notes on the Meteorology of the Month of April, 1871. 
By Pror. O. W. Morris. 
The month of April, 1871, sustained its reputation, haying 
frequent showers, or sprinkles, but not much water. It 
commenced with a snow storm, though not very severe, 
which continued till the morning of the 2d. Rain fell in 
various quantities on 11 days, only 5 of them, however, in 
appreciable quantity, amounting in all to 8°45 inches; which 
is 0°65 inch less than the average for the 10 years preceding, 
2°97 inches less than in April, 1868, and 1°88 inch more than 
in April, 1869. 
The mean temperature was 53°33", which is 326° greater 
than the average mean for April, for the preceding 10 years, 
and greater than any of them, except in 1865 and 1866. 
The maximum was 80°5° on the 9th; the minimum was 384°5° 
on the 2d; a range of 46’, in 7 days. 
The mean pressure was 29°778 inches, the maximum was 
80'368, on the 24th, and the minimum, 29°397 inches on the 
2d; arange of 0°971 inch. It has been above 30 inches 
only on 6 days. 
The mean relative humidity was 50°15", the maximum was 
88°6° on the 28th and the minimum 104° on the 24th; a 
range of 78-2° for the month. | 
The Aurora Borealis was noticed on the 11th, 18th and 
17th. Thunder showers occurred on the 11th and 21st. 
A Solar Halo on the 14th, and a Lunar Corona on the 29th. 
The prevailing wind was N. W. although the 8S. EH. came 
very near being equal. 
May 8th, 1871. 
The President in the chair. ‘Twenty-four persons present. 
Dr. L. FeucHTWANGER exhibited the Tooth of a Mastodon, 
