Art. II— Photography : Its Past and Present. 

 By Ludovic Hart. 



[Read 14th May, 1885.] 



Art. III. — On the Recent Earth-Tremors, and the 

 Conditions which they Indicate. 



By G. S. Griffiths. 



[Read 11th June, 1885.] 



The Earthquake of 13th May, 1885. 



It having grown apparent to every one that the earth's crust 

 in the vicinity of Tasmania has lately, from some obscure 

 cause, become unstable, I have collected all the notices of 

 the last shock which I could obtain, and have examined 

 them with a view — first, to discover the precise seat of 

 seismic activity ; and, secondly, to determine the character of 

 that action. If the evidence available enables. us to accu- 

 rately diagnose the conditions now prevailing below Bass's 

 Straits we may be able, in some degree, to anticipate the 

 immediate seismic future of those regions. 



I have obtained a record of over forty observations, but 

 as some of these are obviously inexact, I have had to exclude 

 them from consideration, retaining thirty-five for exami- 

 nation. Of these, nineteen come from Tasmania, four from 

 New South Wales, and twelve from Victoria. To facilitate 

 comparison I have, in every case, reduced the local time to 

 that of Hobart. 



TABLE OF OBSERVATION. 





M 



"iCTORIA. 





N 

 W4-E 



Place. 

 Melbourne 



Local 

 Time. 



... 9-28 



Hobart 

 Time. 



... 938 



Duration. 



Direction 



Beechworth 



... 9-30 



.. 9-40 







Wilson's Prom. 



... 9-27 



.. 9.37 



... 0' 45" 



... «+ t 



Warragul 

 Flinders 



... 9-31 

 ... 9-30 



.. 9-41 

 .. 9-40 



... 0' 40" 





