266 Meteorological Observations. 
state, or while screwed up for safe transportation ; which are the 
most common causes of error in the adjustment of the scale to its 
proper height in barometers. Now as the mean annual pressure 
at the two places, at the sea level, is presumed to be nearly equal, 
we may add 0.376 inch, or three eighths of an inch, to all the 
results in Mr. Templeman’s summary, for the purpose of com- 
parison with the observations at New York. 
With this assumed correction, we find that the mean height of 
the barometer at St. Johns, at the sea level, for the five half years, 
which include the months of November, December, January, 
February, March, and April, which takes in the winter period, is 
30.039 inches: while the mean of the five half years which in- 
clude the remaining months, is 30.184 inches. ‘The mean pres- 
sure of the half year which includes the summer, we here per- 
ceive, erceeds that which includes the winter, by the amount of 
0.145 inches ; or one seventh of an inch, nearly. 
At New York, I find on the contrary, that the mean presstire 
of the half year which includes summer, for the same period of 
time, is Jess than that of the half year which includes the win- 
ter by 0.044 inch; or something less than ,', of an inch: the 
mean for the winter half years being 3U.133, while that for the 
summer period is 30.089. There appears no reason to doubt the 
accuracy of these results, in either case. ipa 
' This analysis shows also an average difference of pressure at 
the two places for the same half year ; assuming the same annual 
mean: the inequality for the winter period being 0.094 inch, oF 
nearly one tenth of an inch greater at New York than at New- 
foundland ; while for the half year that includes summer, which 
exhibits the least fluctuations of pressure, and in which the equi 
librium of the atmosphere is least disturbed by violent winds, the 
mean pressure is 0.095 inch greater at St. Johns than at New 
York. 
It appears from the table, that the extreme range of the ba- 
rometer at Newfoundland during the five years was 2.54 inches, 
or two and a half inches, nearly: while at New York for the 
same period, as corrected one fortieth for variation in the cister, 
it was 2.265 inches; or two and a quarter inches, nearly. e 
difference of latitude in the two places is 6° 52’; the difference 
of longitude 21° 22’; both places being on the western margi 
of the same ocean. 
