76 THE CLIMATE OF AUSTRALASIA 



rise and fall is inverted when compared with 

 parts of India. But India, as a whole, gives 

 no simple regular period. It has been pointed 

 out by Archibald and Hill, that, while the south- 

 western monsoons of India yield their maximum 

 rains at the time of sun spot maximum, northern 

 India receives most of its rain at the time of 

 the sun spot minimum. This difference 

 between northern and southern India at first 

 seemed fatal to the belief in sun spot control. 

 It is due to the fact that the Indian rainfall is a 

 compound product, which has to be resolved 

 into its elements before the influence of the 

 cycle can be seen. The Lockyers' work has now 

 shown that, while at Mauritius the rainfall 

 curve is comparatively simple, there being one 

 maximum and one minimum in the course of 

 the LI years, the Indian curve for the rainfall 

 from the south-western monsoon is more 

 complex. In India there are two maxima 

 during the course of one sun spot cycle. In 

 addition to its proper maximum of rainfall, 

 corresponding to the Mauritius minimum, it has 

 a secondary maximum at the same time as that 

 at Mauritius ; for the conditions that deter- 

 mine a year of high rainfall at Mauritius extend 

 their influence to India, and thus produce there 

 a secondary maximum. It is not surprising, 

 therefore, that, if we lump the whole Indian 

 rainfall together, we fail to find any simple 

 agreement with the 1 1 years period. 



