hemisphere, except in so far as local peculiarities modify 

 the weather, which results from cosmical causes. 



After referring to various meteorological cycles which 

 have been propounded from time to time, none of which 

 were satisfactory, he proceeded to explain the results of 

 his own investigation which, he said, had convinced him 

 that in a period of nineteen years the general character of 

 the weather returns. He did not mean to say that there 

 will be the same wet, or the same amount of dry weather 

 in every year of a series ; but that the general character 

 of the years in each series will he the same. He said he 

 had detected the period in our rainfall observations, and 

 the suggestion was first made, so far as he was aware, in 

 his "Notes on Climate of New South Wales, 1870," in which 

 a diagram was published, including results from 1840 to 

 18G9. 



Since then Mr. Russell had accumulated a large amount 

 of valuable information bearing on the question, which, 

 although not conclusive, was sullicicnt to cause him to 



that will justify at least a careful examination. 



this Society on 9th June, 1806, entitled "On the periodicity 

 of good and bad seasons." In the interval of twenty years 

 from the date of his previous paper, he had, with unweary- 

 ing patience, continued to pile up further facts in relation 

 to the weather, and these, together with investigations 

 into the floods on the Darling and the floods in Lake George, 

 and a careful study of the rainfall and general weather 

 statistics, and the diagrams of various weather records, 

 barometer, thermometer, wind duration, and force, and 

 rainfall of different Australian latitudes, from 1840 to 

 1887, had convinced him that there was a periodicity in 

 weather. 



