114 



Prof. Hughes, 



[Mar. 9, 



+ Posthumously deformed. 



Mean of Male Indices only. 



(3) On the Recurrence of Ice Ages. By Prof. T. McKenny 

 Hughes, M.A, F.RS. 



Part IV. On some scratched stones from the Permo-Car- 



BONIFEROUS ROCKS OF SOUTH-EASTERN AUSTRALIA AND 

 THEIR MODE OF OCCURRENCE. 



I have on a former occasion 1 laid before the Society a large 

 number of sections and specimens bearing upon the question of 

 the recurrence of ice ages and discussed the inferences which it 

 appeared to me might be drawn from the evidence. I then 

 laboured under two difficulties ; one was that I had no specimens 

 to exhibit in illustration of the glaciation of the basin of the 

 Indian Ocean, and no trustworthy information as to the exact 

 manner of occurrence of the glaciated rocks in it. The other was 

 that a plausible and attractive theory referring the phenomena to 

 extra terrestrial causes was in favour and the conclusions I urged 

 were proportionately depreciated. 



Now, however, through the kindness of Professor Edgeworth 

 David of the University of Sydney I am able to exhibit specimens 

 of the striated rocks which he obtained from the boulder beds of 

 South-eastern Australia and photographs of sections in the deposits 

 in which they were found. 



1 Proceedings Camb. Phil. Soc., 1894, Vol. viii., pp. 98 and 219. 



