138 H. S. JEVONS, H. I. JENSEN AND C. A. SUSSMILCH. 



of this petrographical province. The exact relation of the 

 intrusive members to the lavas has not yet been satis- 

 factorily determined, nor has the order of succession for 

 either the intrusive or volcanics been definitely decided 

 for this region. Until more complete information is avail- 

 able upon these points, we feel that it is somewhat pre- 

 mature to theorize as to the origin of the magma or 

 magmas from which these rocks were derived. 



NOTES ON TWO LIGHTNING FLASHES. 

 By F. H. Quaife, m.a., m.d. 



[Read before the Royal Society of N. S. Wales, August 7, 1912.] 



Several years ago there was a short but severe thunder- 

 storm, concentrated over the district of Paddington and 

 west Woollahra, between 10*30 a.m. and noon. Light to 

 medium heavy rain fell during it, and the lightning and 

 thunder were mostly not of the more pronounced kind. 

 Towards the end however, they became more marked, and 

 then nearly immediately over head but slightly to the 

 north, there was a blinding flash and instantly a crash, not 

 at all like usual thunder, but crackling as of thousands of 

 ordinary Chinese crackers exploding. My study faces south, 

 and a friend and I seated in it did not notice the flash as 

 so out of the common, but those in the back part of the 

 house described it as above stated. It was evidently so 

 close that I felt that some part of the premises had been 

 struck. I ran out, and looked round to the back from the 



