34 Evidences of Glaciation in the Australian Alps. 



cosmic or terrestrial causes which produced the glaciation of 

 the Northern Hemisphere were alike active in the Southern ; 

 but it is of intrinsic scientific value as affording a clue to the 

 unravelment of many highly complex biological problems 

 relating to the distribution, evolution, and extinction of 

 endemic organic forms. 



ADDENDA. 



Since the foregoing remarks were made I have, in justice 

 to Dr. von Lendenfeld, to acknowledge the receipt of a letter 

 from him, dated 21st inst., in which he has kindly drawn 

 my attention to the fact that glacier-polished rocks have 

 been photographed by Mr. Brown, Government Geologist at 

 Adelaide, or some other gentleman, and he remarks : " I 

 have seen the photos, and do not doubt that the rocks 

 photographed really are glacier polished." This would con- 

 firm my previous suggestion, that the area of glaciation was 

 very extensive. I must thank the doctor for his kindness 

 in stating facts which would seem to be at variance with his 

 own original deductions from an examination of the Mount 

 Kosciusko plateaux. 



Art. VI. — On the Dynamical Equivalent of a Pressure. 

 By T. Wakelin, B.A. 



[Read 13th August, 1885.] 



