10 £. Loomis— Results derived from an examination of the 
rain-fall was less than one-tenth of an inch, showing that the 
principal rain-fall does not take place at the center of a low 
rea, but considerably to the east of that center. 
An area of low barometer may have considerable progres- 
sive motion when there is no rain-fall, as is shown in several 
examples quoted in my 7th paper; but the abundant rain-fall 
which usually accompanies great barometric depressions tends 
greatly to modify the movement of the storm’s center. Since 
this rain-fall takes place chiefly on the east side of the low 
center, the heat which is liberated in the condensation of the. 
aqueous vapor causes a stronger inflow of air on the east side and 
a continued fall of the barometer on that side. If there should 
be a great precipitation of vapor on the west side of the center of 
least pressure, this must be accompanied by ascending currents 
of air on that side which would oppose the establishment of 
the equilibrium of pressure on that side, and the center of the 
Precipitation, March 9-14, 1874. 
9.1; 9.2 9.3 10.1{10.2/10.3/11 1/11.2/11.3/12.1/12.2)12.3/13.1/13.2113.3 14.1 
Rochester ng tee i Ge) 8 Gat 02) -01 *22| *04/ -02| °10| -09| -03) -u4! - 
Montreal s 10) 03) +20) 20} -07 “01 “01 
Ottawa 20}: 10)... *30) -10 
Quebec | 20 30 20) -10) 20 
Father Point OL) -05) - 02 33) 
Cape Rosier 57} 03) -19) - 10) -15} 05) 10} -30) 10 
Chatham LC tkU BO | O01) “O01 
to about one foot of snow, and this snow-fall exispied a 
. 
