atmosphere be affected by the comet at the times of its 

 perihelion in such a manner as to produce abnormal droughts 

 or floods, it is certainly not discernible in the Nile's curve. 

 It is, however, worthy of note that, notwithstanding that the 

 comet's period of revolution since the year B.C. 11 has not 

 been regular, the range being from about 75 years to about 

 79 years, it would appear to be in some mysterious way 

 subject to the same cosmical law which not only causes 

 the remarkable changes in the character of the weather at 

 nineteen year intervals, but the occurrence of earthquake-, 

 of greatest intensity at the same places, or along the same 

 parallels of latitude, is particularly noticeable at the critical 

 points of change in the Nile's curve, and' at nineteen year 

 intervals from those points. To prove this, if we take the 

 intervals between the following appearances of llalley's 

 comet, it will be seen that they are all multiples of nine- 

 teen years : — 



B.C. 11 

 A.D. 141 



1 .-»■_' 



60S 

 760 



* 1531 



191 1607 



76 



A.D. 65 

 „ HI 



76 



608 

 912 



„. 1531 

 * 4 1759 



228 



218 



1083 



% 



1531 

 ,b 1835 



»4fi 1607 



" 6 1759 

 iv> K)0T 



30+ 

 152 



„ 373 



1083 



1378 

 1682 



*M !s35 



76 



