4  £. Loomis— Results derived from an examination of the 
east of the center of low pressure, and in twelve cases it was 
west of this center. If, however, we consider the middle of the 
rain-fall as corresponding to a date four hours preceding the 
’ barometric observation, we shall find that in four of these cases, 
iz: numbers 1, , and 54, the principal rain-fall occurred 
when the rain center was east of the center of low pressure, or 
at least very near it. In several of the cases, however, the rain 
a was clearly west of the center of low pressure, and 
of the cases the rain-fall apparently had a decided nfl 
ies upon the direction of the storm’s progress. 
specially true of numbers 45, 46 and 47, in which case he cen- 
ter of minimum pressure moved westward instead of eastward. 
As this Eas is a very remarkable one, I will consider it 
800 or 400 miles. The barometer fell steadily during the ian 
‘and a center of minimum pressure which had prevailed for 
twenty-four hours near the coast of Florida, advanced rapidly 
northward. During the evening of the 19th the same winds 
continued with increasing strength; the rain-fall increased espe- 
cially about — n and New London ; the barometer con- 
tinued to fall, and the center of minimum pressure advanced 
to Norfolk. On the morning of the 20th’the same system of 
winds prevailed but had advanced further northward, the south- 
east winds near the coast extending from New York to Nova 
Scotia, and having a velocity of twelve to twenty-five miles, 
and were opposed by fresh winds from the north and west in 
the vicinity of Lakes Erie and Ontario. At Quebec the wind 
blew from the east, forty-six miles per hour, and on Mt. Wash- 
ingtoa the wind blew from the southeast seventy-five miles per 
hour. The total rain-fall: . all the stations during the preced- 
ing eight hours was greater than was recorded for any other 
equal period during the fifteen months under discussion. The 
center of minimum pressure had now reached Cape May, and 
the center of the rain area was 250 miles further north. During 
the 21st the system of east winds near the coast of New Eng- 
land and Nova Scotia had pushed further into the interior, and 
in the afternoon extended to Rochester, which was now the cen- 
ter of greatest rain-fall, while the center of minimum pressure 
moved slowly in the same direction. The wind at a still 
w from the east, forty-two miles per hour, and on Mt. Wash- 
