78 Contributions to Meteorology. 
Rain fell on 88 days, amounting to 47-131 inches and was ac- 
companied by thunder and lightning on 17 days.—NSnow fell on 
days amounting to 84:61 inches ox the surface. The quit 
of 1 to 10 as used by the Smithsonian Institute at Washington, 
for the comparison of melted snow to rain, does not hold good in 
this climate: it varies from lto 5tolto8 I im undertaken 
a series of experiments on this point, which I have not at present 
bronght to a close. 
he whole amount of snow which fell in the winter 1851-2, 
amounted to 95-920 inches; the first snow fell on the 25th of 
October, 1851, and the last on the 16th of April, 1852. 
e amount of evaporation was regularly measured and re 
corded during that period of the year, when the thenadenelll 
stood above the freezing point, and owing to frosty nights, an 
frost also during some days, no accurate measure could be taken. 
The amount of evaporation in May, was 3-720 inches, in June 
3-450, in July 4-150, in August 2°620, in September 2-020, and 
"in October 1-220: this s period includes me I consider could be 
taken with anything approaching to accuracy. 
The most prevalent wind during the year was the West, the 
next in fe agg was the BE. N. E., the least prevalent wind was 
the N. by W. The mean of the maximum velocity (as measured 
by an aectweled similar in construction to Dr. Robinson’s) was 
17-632 miles per hour; the mean minimum velocity was equal 
to 0-463 miles per hou 
The Aurora ea ag was visible on thirty-six nights, at the 
following hours, and its appearance was generally followed pe 
rain in summer and snow in winter. 
January 19th, 10 p.m. Faint ip arch—sky clear; 26th, 10 
Do., da rk clouds in the hor 
" February 15th, 4 a. M. rab a aurora in the north, streamers shoot- 
ing to the zenith; sky clear.—19¢h, at 6°30 Pp. m., the hen yens presented 
a ‘curtain or canopy of auroral light 5 streamers ‘of yellow, green and 
crimson were sent up in rapid succession from the horizon ee the zenith, 
where they formed a cupola or corona near @ Auri t the hori- 
zon, the arch extended — E. to N. We Stars of the oh and 5th 
mer part of the evening: 1 ese olin Y last ed 20 ag utes ; the 
northern arch remained still visible. Volta’s No. 1, electrometer, 
marked 0°76 positive electricity ; there was no ‘ilies Hiatt during, 
or after the ee —201 uh, I 10 p. m. Low auroral arch in the north, 
very faint; sky clear 
