Meteorological Observations. 267 
Observations at Canton. 3 
_ If we now turn to the observations at Canton, we shall find the 
mean half yearly results for the same months, for ten years, as 
follows: viz. 
Mean pressure of ten half years, November to April 
inclusive, 30.140 inches. 
Mean pressure of pine half years, May to Qotober 
inclusive, 29.868 inches. 
Thus, at Canton. the mean peesiaee of ‘the winter half year 
exceeds that of summer, 0.272 inch, or more than one fourth of 
aninch. The latitude of Canton is 23° 07’ N., being nearly in 
parallel with the north side of Cuba and part Ee the Bahama Isl- 
ands: lon. 113° 14’ E. The mean height of the barometer for 
the ten years observed at Canton, is 30.005 inches; but if we 
add a correction for an assumed elevation of 40 feet above tide, 
it will be 30.051 inches. We may infer, therefore, that there is 
little error in the adjustment of the scale of inches in this ba- 
rometer. 
Assuming the same mean annual pressure for Canton as at New 
York, the following comparison of the half yearly results at these 
two places may be instituted. 
Winter half year. Summer half year. 
Mean at New York, 30.133 30.089 
Mean at Canton, as adopted, 30.246 29.974 
Excess at Canton, 0.113in, Excessat N. Y., 0.1165 in. 
The inequality at these places for the two periods, being the 
same in kind, but differing in degree by more than one ninth of 
an inch ; the inequality being greatest at Canton. 
If the results at St. Johns, Newfoundland, be compared in like 
manner with those at Canton, they will appear as follows: 
Winter half year. Summer half year. 
Mean pressure at Canton, 30.246 in. 29.974 in 
30.184 
Mean do. at Newfoundland, 30.039 
0.207 in. Excessat N. F., 0.210 in. 
Excess at Canton, 
These results are different in kind and the inequalities greater 
than those between Canton and New York: the mean inequali- 
ties being more than one fifth of an inch. 
