19 
Dr. O. W. Morris read the following paper :— 
Summary of Meteorological Observations at Cooper Union, 
for the months of March and April, 1878. 
March, 1878. 
The temperature at the beginning of the month was 29.5°; 
at its close, 45°. The maximum, 52°, occurred on the 80th, 
at 2 P. M.; the minimum, 11°, on the 5th, at 7 A. M., a 
range of 41°. The lowest mean for any single day was 
17.33°, on the 4th; the highest mean, 47.66°, on the 80th,— 
a difference in mean temperature of 80.383°. The mean for 
the month was 36.49°; warmer than March 1872, by 6.25°, 
but colder than 1871, by 8.28°, and 1.08° colder than the 
average for the ten years preceding. The greatest daily 
range was 21°, on the 6th, and the least, 1.5°, on the 20th. 
The amount of rain and melted snow was 8.25 inches. 
The prevailing winds were N. W. and W. 
On the 17th, the mean humidity was 381°, and on the 29th, 
95°, a range of 64° in twelve days. The mean for the whole 
month was 61.44°. 
The barometer indicated 30.564 inches on the 6th, and 
29.024 inches on the 29th, a range of 1.54 inches. The mean 
for the month was 29.809 inches; less than that of March 
1872, by .06 inch. 
One solar halo, one lunar halo, and one parhelion, were 
observed. 
The mortality of children under one year old was 583, 
and under five years, 991. The total number of deaths for 
the month, from all causes and of all ages, in this city, was 
2394. 
April, 1878. 
_ The temperature on the morning of the 1st was 42°; and 
the maximum was attained on the 2d, 62.5°. It was at 40° 
or above, at 7 A. M., on every day except the 13th, when it 
had fallen to 87°. On the evening of the 12th, also, it 
reached the same point: this was the minimum, the range 
for the month being 25.5°. The highest mean was 55.06’, 
on the 28th; and the lowest 40.98°, on the 21st; a difference 
of 14.13°. The mean for the month, was 47.35°, which was 
lower than that of any April for ten years past, except 1868, 
which was 3.91° colder. 
The prevailing wind was N. EH. 
