EARTH MOVEMENTS AT BURRINJUCK. 149 



of temperature changes, which is so well recognised as a 

 process of weathering, extends far deeper into the earth's 

 crust than has previously been recognised. 



This discovery of the relation between the movements 

 of the pendulums and the temperature variations is a most 

 important one in connection with the primary investigation 

 of the deflections due to the water load; for the movements 

 due to the temperature changes are large and must be 

 sorted out in order to evaluate correctly the other move- 

 ments. 



These relations between the temperature changes and the 

 movement of the outer shell of the earth's crust are very 

 interesting in themselves, and the author proposes to 

 investigate them further by comparing the underground 

 rock temperatures with the insolation at the surface for 

 different months of the year. This will, of course, involve 

 a detailed study of the topography in the immediate neigh- 

 bourhood of the pendulum station. This study is now being 

 carried out in connection with the geological survey of the 

 area. 



The results so far obtained are very encouraging and 

 the research promises to provide the most interesting and 

 important information with regard to some of the geo- 

 physical problems of the earth's outer crust. 



