f> E. Loomh—Vonti'tlnil'tohx to Meteorology. 



which the principal rain-center was more than 500 miles south 

 of the center ..f l.-a-t pre- ure are designated by ap; 

 numbers. The following table shows the nine cases in which 



L000 miles. Column first shows 

 the reference number laken from the table on page 2 ; column 

 second shows the date of occurrence; column third shows the 

 station at which the rain fall was greatest, and column fourth 

 shows the latitude of the station. 



71 _ A» ] y - : 1 I-hiUulelpKia 39 57 



We see that all but one of these stations were south of lat. 

 36° and the rain in these cases appears to have resulted from 

 opposing wind- attending the advance of a wave of high pres- 

 sure from the west or northwest. In each of the cases there 

 were indications of a cyclonic movement of the winds which 

 was of a local character and of small geographical extent, and 

 produced only a slight effect upon the barometer. These rain- 

 areas were not of very great extent, the majority of them being 

 less than 200 miles in their longest diameter. No. 71 was of 

 very small dimensions, as will appear from the following table 

 which shows the rain-fall for eight hours at all the stations 

 withm 175 miles of Philadelphia. The stations are arranged 

 in the order of longitude from west to east. 



In the nine cases above enumerated, the ram-fall had appar- 

 ently very little influence upon the direction in which the 

 principal low center advanced, or upon its rate of progress. 

 This result accords with the conclusions arrived at in mv sixth 

 paper. 



There remain only six other cases in which the principal 

 ■r was in either of the western quadrants, viz: >' ( ^- 

 8. 10, 23, 41, 55 and 68. 



In No. 8 the lowest isobar (29*70) formed an oval whose 



