4 8 



THE CLIMATE OF AUSTRALASIA 



apart from one another, they do not, by any 

 means, coincide with the highest points of the 

 rainfall curve. The diagram shows no particular 

 agreement with an 1 1 years cycle. Take again 

 a diagram that shows the rainfall over a much 

 wider area. Fig. 7 shows the amount of water 

 collected in different years by the greatest rain 



txxooe.too.eoo 



1<5*.OWS 000,0*0 



I0400.0<XV>00 



3 ~ S- 



T H 1 1 ? H i M 1 1 1 f 7 i j it i r 1 1 < T 



smii 





x Is the year of maximum discharge ; x, x, mark periods n years apart. L is the 

 year of lowest discharge ; L, L, 1 1 year periods from it. 



FIG. 7. Variations in the volume of the River Murray, near Mildura. 



gauge in Australia the River Murray. The 

 river gaugings taken near Mildura show great 

 variations in the volume of the Murray ; and 

 the variations show no agreement with the 1 1 

 years period. The floods of the Darling (fig. 8) 

 also show no support to the 1 1 year cycle. 



While Lockyer and Meldrum have advocated 

 an 1 1 years cycle in connection with the sun- 

 spots, other men have claimed that the weather 

 varies in cycles of longer periods. Dr. Russell, 

 of Sydney, to whom Australian meteorology is 



