aoe J. H. MAIDEN. 
Paper read,—1. ‘“‘On the Water Supply of Sydney from 
George’s River and Cook’s River,’’ by Mr. Chas. Mayes, 
which he illustrated with diagrams. 2. ‘‘On the results 
of the Chemical Examination of Water for the Sydney 
Water Commission,”’ by Professor Smith. 
Fifteenth Monthly Meeting, Hall, Australian Library, 
2nd June, 1869. Professor Smith in the Chair. 
Member elected.—S. L. Bensusan Hsq. 
Papers read.—1. ‘‘An analytical solution to Sir William 
Hamilton’s problem on the inscription of closed n‘gon’s in 
any quadric.”’ 2. “Important new theorem in the geometry 
of Three Dimensions.”’ 3. ‘‘An exposition of the American 
method of levelling for Sections—its superiority to the 
Hnglish and French methods as regards actual field practice 
and subsequent plotting of the Section.’’ (All read by 
Martin Gardiner Hsq.) — 
Sixteenth Monthly Meeting, Hall, Australian Library, 
2nd June, 1869. His Excellency the Harl of Belmore in 
the Chair. 
Paper read.—‘‘On the Hlectric Telegraph between Hng- 
land and India, and how to connect the Australian Colonies 
with the Telegraphic Systems of Hurope and America,’’ by 
Mr. H. OC. Cracknell, which he illustrated by 12 electric 
batteries representing 12 repeating stations on the proposed 
circuit between Sydney and London, and by diagrams. 
Seventeenth Monthly Meeting, Hall, Australian Library, 
5th August, 1869. Rev. W. B. Clarke in the Chair. 
Member elected.—Mr. G. A. Mansfield. 
Paper read.—‘‘On the Geological Structure of the country 
around Goulburn,’’ by Dr. Thomson, which he illustrated 
by a geological map of the County of Argyle and by speci- 
mens of the rocks and fossils. 
