Observations of the United States Signal Service. 5 
_ Sure was apparently pushed still further toward the northwest, 
but as this center hadi now passed beyond the stations of ob- 
Servation, it is impossible to locate it with precision. — 
Plate I shows the curves of equal rain-fall for October 20, 
7.35 a.m. The outer curve shows the extreme limits of the 
rain-area during the preceding eight and one-half hours; the 
next curve shows the limit of one half inch rain-fall; the third 
curve shows the area over which the rain-fall was at least one 
inch ; and the inner curve shows the area of one. a half 
inch rain-fall. At Philadelphia and Burlington the rain-fall 
was 1-96 inch during the eight and one-half hours, and it 1s 
Probable that near the center of the rain area the rain-fall ex-. 
