Solar Chaw/ex of 7V///y>ov/V/r and Variations in Rainfall. 427 



n subsidiary solar pulse. We propose to return to this subject in a 

 subsequent communication, after inquiries have been completed relat- 

 ing to 1885-86 and 1896-97. 



Tlif Intern/Is between the Pulses. 



There will obviously be intervals between the ending of one pulse 

 and the beginning of the next, unless they either overlap or become 

 continuous. 



The + and - pulses, to which our attention has been chiefly directed, 

 are limited in duration ; and when they cease the quantity of rain 

 which falls in the Indian area is not sufficient without water storage 

 for the purposes of agriculture ; they are followed, therefore, by 

 droughts, and at times subsequently by famines (fig. 2). 



Taking the period 1887-89 we have 



Rain from - pulse 



No rain pulse ...... 



Rain from + pulse- 



No rain pulse 



77 

 78 

 79 (part) 



79 (part) 



80 (central year) 

 l (part) 



:81 (part) 

 82 

 83 

 84 (part) 

 84 (part) 



| (central years) 



87 (part) 

 C 87 (part) 



Rain from - pulse < 88 

 189 



The duration of these + and - pulses of rainfall was determined 

 in the first instance by the Mauritius rainfall, which shows both pulses : 

 and later from the Malabar rainfall, which perhaps shows the effect of 

 the south-west monsoon in its greatest purity. 



All the Indian famines since 1836 (we have not gone back further) 

 have occurred in these intervals carried back in time on the assumption 

 of an eleven-year cycle. 



The following tables show the result for the two intervals : 



