420 Sir Norman Lockyer and Dr. W. -I. S. 



Inches. 



-1867-8 134 



- +1871-2 110 



-1877-8 207 



+ 1882-3... 81 



From these tables it follows that both in rainfall and snow the* 

 quantity is increased in the years of the rise l>oth of the unknown and 

 iron lines. 



Other llainfall*. 



Being in presence of pulses of rainfall in India during the south-west 

 monsoon, corresponding with pulses of solar change, it l>ecame necessary 

 to attempt to study their origins. AVe may, add that other pulses were- 

 traced, especially one in 1875, but the simplest problem was considered 

 alone in the first instance. 



The rainfalls at the Mauritius, Cape Town, and Batavia, were 

 collated to see if the pulses felt in India were traceable in other 

 regions surrounding the Indian Ocean to the south and east. 



Tlw Mauiitiuft Rainfall. 



The rainfall of Mauritius has been obtained by utilising the results 

 that have been published in the Blue Books* issued by the Royal 

 Alfred Observatory since the year 1885. The volume for 1886 give* 

 the yearly total rainfall for every station that was then in use from 

 1861 up to the year 1885, and these values have been employed; since 

 then, the yearly values have been obtained direct from each of the 

 yearly volumes subsequently published, i.e., to the end of the year 

 1898. 



It was at first thought that the total Mauritius rainfall could be 

 fairly obtained by employing for the period between 1861 and 1886 1 

 the means of several stations as given by Meldrum,t and continuing 

 the values from the observations published in the more recent yearly 

 volumes. 



It was found, however, that from 1861-1880 the rainfall was 

 obtained from the observations of four stations, while from 1871- 

 1886, the observations from eight stations were employed. 



As a study of all the published data showed that more stations 



* " Mauritius Meteorological Results." 



t 1861-1880. 'Relations of Weather to Mortality, &c.,' 1881, p. 30. 1871- 

 1886. 'Annual Report of the Director of the Royal Alfred Observatory for 

 1886,' p. 18. 



