E.. Loomis— Observations of the U. S. Signal Service. 97 
The average velocity of storm centers as shown by the 
monthly Reports of the Signal Service is almost identical with 
that which I had previously deduced. As these two results 
are based on the observations of six and two-thirds years, it is 
probable that they will not be greatly changed by a longer con- 
tinuance of the observations. Dr. Neumayer’s result is deduced 
from observations of two years, extending over every part of 
Europe, and is probably a close approximation to the average 
velocity of storm centers in that country. The average velocity 
of storm centers in the United States 1s seen to be 69 per cent 
greater than it is in Europe. In my tenth paper (this Journ., 
vol. xvii, p. 3) I determined the average velocity of storm cen- 
ters on the Atlantic Ocean to be 14 miles per hour, which is 
a less than the value above found for the continent of 
urope. : 
It appears then to be an established fact that storms travel 
od hour, and the average velocity at Vienna is 11°5 miles per 
4 sate 
