16 E. Loomis — Contributions to Meteorology. 



lines show the boundaries of a half inch rain-fall— one inch 

 rain-fall— ami two inches ruin-fall. The position of the center 

 of low pressure four hours previous to the given dates, is shown 

 by a small circle near the word LOW. The velocity of the 

 wind at each station is indicated by the number placed near 

 the point of the arrow at that station. 



In No. 4 the winds at Cli rleston and Augusta were blowing 

 towards each other with velocities of thirty and nineteen miles 

 per hour, and the rain at Charleston amounted to 3'86 inches 

 in pixteen hours. This case is the same as No. 37 on page 2. 



In No. 8 the winds at Savannah and Charleston were blow- 

 ing towards each other with velocities of eighteen and thirty- 

 -ux miles per hour, and the fall of rain at Charleston amounted 

 to ..i-ht na-he- in <ixi".M] hours. This case is the same as No. 

 60 on page 3. The conclusion seems unavoidable that in these 

 eases the air ascended from the earth's surface with great vio- 

 lence and was carried up to such a height that its vapor was 

 condensed with unusual rapidity. It will also be observed 

 that the greatest rain-fall occurred on the northeast side of the 



In order to determine the duration of great rain-falls. 1 pro- 

 ceeded in the manner described in my seventh paper. I se- 

 lected all those cases in which any of the rain -falls mentioned 

 in the table on page 2, for the years 1873, 4 and 5 were fol- 

 lowed by at least four and a hall inches of ram (total amount 

 at all the stations) durimra succeeding period of ei-jlit hours: 

 and for the year 1877 were followed by at least five inches of 

 ram during the next eight hours. The table on page 1< shows 

 the result of this comparison. Columns seven, ten, 

 etc., generally show the station of greatest rain-fall for the 

 given date; but whenever the station of greatest rain-fall wM 



ently connected by a continuous rain-area with the 

 si tion mentioned at th< preceding observation, if there was a 

 third station where the rain-fall was at least a half inch, and 

 which could be thus connected with the first station, this thud 

 station has been inserted in the table instead of the second, 

 ark applies to the follow-in- cases, viz : No. '•< Albany. 

 No. 8 St. Paul, No. 12 Cincinnati, No. 15 Boston, No. 17 



mi, New York and Philadelphia, No. 18 Duluth, No. 

 21 Cape Henry, No. 27 Boston, No. 28 Mt. Washington, No. 

 m' Memphis, No. 32 New London, No. 33 Charleston, No- 34 

 Cape May and No. 35 Atlantic City. By this mode of com- 

 parison, the continuous rain areas. 'in the eases named, are 

 ►nger duration than if the comparison had 

 been restricted in all cases to tit rain-fall 



^ [l<i]i a nilu ;(r '- ; ' is called continuous between two - 



tderstood that there was a belt of rain, amounting to 

 at least a half inch in eight hours, connecting the two stations. 



