CONTRIBUTIONS TO METEOROLOGY. 309 
coming from Mr. McCord, the ‘‘ Pioneer of Canadian Meteorology.” This reading 
is the highest recorded by him. At Montreal, Dr. Hall gives the daily mean of 
the reading as 30.744 inches. At Point St. Charles, the highest reading was 
30.771 inches. At Portland, Maine, Mr. Henry Willis gives the maximum reading 
of the day at 30.70 inches. The lowest reading was at 6 A. M., on the 19th of 
March, and indicated 28.620 inches. The readings at Portland on that day, are 
recorded as being also the minimum reading of the year. This circumstance of 
low reading has given the greatest monthly range of the year to March. August 
gives the lowest range of the year, viz., 0.580 inches. The mean Barometer 
pressure for the year was 29.821 inches, which exceeds by 0.008 of an inch only, 
the mean of last year. The mean height of the Barometer for the months were 
as follows : 
January.. 30.021 inches. | May..... 29.834 inches. | September 29.771 inches. 
February.) 29.8387 “| June..... 29.784 « October .. 29.779 
March. .. 29.686 “ | dUtlynys ses AaB 18) November 29.940 “ 
April.) 29.688! “' '! August!.. 29.760 December 29.971 “ 
The monthly range for the year was as follows : 
January... 1.487inches. | May...... 0.696 inches. | September. 1.063 inches. 
February... 1.588 “ June...... OLGA, was October... 0.909 <“ 
March .... 1.872 <“ dimly apase 0.564 “ November. 1.259 “ 
April... 1.282)“ August ... 0.530 “ December . 1.316 “ 
The greatest range within twenty-four hours, with a rising column, occurred on 
the 2nd and 8rd of December, and rose from 30.062 to 30.661 inches, equal to a 
rise of 0.599 of an inch, and the greatest range with a falling column, was on the 
18th and 19th March, and which fell from 29.650 inches to 28.620 inches, equal to 
1.030 inches of variation ; a sudden rise also occurred on the 14th September from 
8 A. M. till 1 P. M., and indicated 0.251 of an inch of rise in three hours. 
Temperature of the Atmosphere——The mean temperature of the year was 
40°73 F., which is 0°69 of a degree higher than the mean of last year (1858,) 
and indicates 0°83 of a degree lower than the mean of a series of years. This igs 
owing to the low temperature of January and of December. The mean tempera- 
ture of the months is as follows: 
January ........ 10°90 | May...... gaeeaé 59°42 | September...... 54231 
DY UALY)/«)s/0.0) 0, ahs WBS G 2M DUGG Jays, 2\)el ahny>)+)e) G2200),)Octobers ~. 2. =. 42°42 
Li a aes SOC OB Iie ya oie) abn y's ..»- 67°58 | November....... 29°38 
PATNI ae oy42 ava 38°63 | August...... «-. 68°72 | December’ ..,... 8°93 
December is the coldest December on record here by 4°83 degrees, compared 
with a series of years. February of last year (1858) was the coldest February on 
record here, the mean temperature being 7°56. July, which for a series of years 
has indicated the highest mean temperature, was 1.14 degrees lower than the 
month of August. This was owing to the heavy rain storms of July. June of 
1858 was the warmest month of that year—the highest reading of the Thermometer 
for this year was on the 17th of May, and indicated 99.2 degrees, which is the 
highest reading of the Thermometer for the month of May on record, The highest 
