48 PROCEEDINGS OP SECTION A. 



12.— THE NATURE OF Y RAYS. 

 By P. W. Bmlidge. 



13.— ON THE SELF-INDUCTANCE OF A COIL. 

 By Professor T. R. Lyle, M.A., DlSc, F.RS. 



14.— ON THE NATURE BETWEEN THE LOSS OF ENERGY 

 OF CATHODE RAYS AND THE lONISATION PRODUCED 



BY THEM. 



By Dr. J. L. Glasson. 



15.— ON ORTHOGONAL CIRCLES. 

 By Evelyn G. Hogg, M.A. 



16.— ON STEINER'S ENVELOPE. 

 By Evelyn G. Hogg, M.A. 



17.— AUSTRALIAN LONGITUDES. 



By P. Baracchi, F.R.A.S., Government Astronomer of Victoria. 



In a previous paper on this subject*, the following values of Aus- 

 tralian Longitudes, based on the Telegraphic method alone, were 

 deduced from a discussion of all the data available up to 1894 ; — 



Place. Longitudes E. 



H, M. S. 



Port Darwin .. .. .. 8 43 22-34 



Adelaide Observatory .. .. 9 14 20*14 



Melbourne Observatory .. .. 9 39 53-99 



Sydney Observatory .. .. 10 4 49-39 



The Port Darwin Station was at that time still regarded as our initial 

 meridian. Its Longitude was determined in 1883 by measuring tele- 

 graphically the interval Singapore-Port Darwin, this being, then, 

 the last link required to connect the Prime Meridian of Greenwich 

 with Australia by a chain of Longitudes entirely based on the Telegraphic 

 method, and extending eastward from England through Egypt, India, 

 and Singapore to Australia. 



• p. Biracchi. Oq the most probable Value and Error of Australian Longitudes, including 

 that of the Boundary Lines of South Australia with Victoria and New South Wales. 



