E. Loomis— Observations of the U. S&. Signal Service. 19 
the center of high pressure; and such cases are designated by 
the character = in column fifth of the table. Sometimes the 
direction of the upper clouds was such as would carry them to 
the right of the high center; and such cases are designated by 
the term right in column fifth of the table. Generally, how- 
ever, the direction of the upper clouds was such as would carry 
them to the left of the high center. Such cases are designated 
by the term Jef in column fifth of the table. We perceive 
that the movement towards the left of the high center is more 
than twice as frequent as towards the right; that is, while the 
movement of the upper clouds is from an area of low pressure 
towards an area of af h pressure, there is a tendency to circu- 
late around the high Suse in the same direction in which the 
surface winds circulate around a center of high pressure. Thus 
we see that near the earth’s surface there is a steady but eieoa. 
itous movement of the air from an area of high barometer 
towards an area of low barometer where the air ascends, and 
thence by a retrograde movement it returns to some area of 
high ones (perhaps the same one from which it started), 
where it descends to the surface of the earth and again repeats 
the same or a similar movement. 
A similar circulation of the air is indicated by the observa- 
tions of Siar Segal at Iceland when compared with observa- 
tions in Central Eur 
OL 
ae se 
‘pon Misra the de epartures from th 
temperature at Iceland and Vienna for these twenty-six oe Re 
we obtain nearly the same result as had been previously _ 
deduced from observations of fifteen years. 1 ollowing 
comparison for three pepe 
oe mber and January, for the entire period of forty-one years. 
Column second for each month shows all Re get the 
