Viii.) 



Pagb 



Art. XII.— The Origin of the Small Bubbles of Froth. By J. A. 

 Pollock, d. sc. Professor of Physics in the University of 

 Sydney. [With Plates VIII, IX, X.] 204 



Art. XIII. — Suicide in Australia : A Statistical Analysis of the 

 Facts. By G. H. Kntbbs, c.m.g., p.r.a.s., f.s.s., etc.. Com- 

 monwealth Statistician, ... ... ... ... 225 



Art. XIV. — Note on a new type of aperture in Conularia. By 



Chas. F. Laseron. [With Plate XI.] 247 



Art. XV. — The River Gravels between Penrith and Windsor. By 



H. I. Jensen, d.sc 249 



Art. XVI. — An Autographic Air-Flow Recorder. By W. R. 

 Hebblewhite, b.e. (Communicated by Prof. S. H. Barra- 

 clough, b.e., m.m.e.) [With Plate XII.] 258 



Art, XVII. — On some New England Euoalypts and their Economics. 

 By R. T. Baker, f.l.s., and H. G Smith, f.c.s., Technological 

 Museum, Sydney. [With Plate XIII.] 267 



Art. XVIII. — On Rock Specimens from Central and Western 

 Australia, collected by the Elder Scientific Exploring Expe- 

 dition of 1891-2. By J. Allan Thomson, b.a., d.sc. f.g.s. 

 (Communicated by Prof. David, b.a., c.m.g., f.r.s., Hon. 

 d.sc. Oxon.) [With Plate XIV.'] 292 



Art. XIX. — A suggested explanation of Allotropism based on the 

 Theory of Directive Valency. By F. B. Guthrie, f.i.c, 

 Department of Agriculture. ... ... ... ... ... 318 



Art. XX. — The nature and origin of Gilgai Country; with notes 



on Quaternary Climate. By H. I. Jensen, d.sc ... ... 337 



Art. XXI. — Some Curious Stones used by the Aborigines. By 



R. H. Mathews, l.s. [With Plate XV.] 359 



Art. XXII. — On the Australian Melaleucas and their Essential 

 Oils. By Richard T. Baker, f.l.s., and Henry G. Smith, 

 f.c.s., Technological Museum, Sydney. [With Plates XVI- 

 XXIV] 365 



Art, XXIII. — The Geology of the Eruptive and Associated Rocks 

 of Pokolbin, New South Wales. By W. R. Browne, b.sc, 

 and A. B. Walkom, b.sc, Demonstrators in Geology, Uni- 

 versity of Sydney. [With Plates XXV -XXV III.] 379 



Art. XXIV. — The value of the Nitrate Figure in determining the 

 fitness of Water for Drinking Purposes. By C. S. Willis, 

 m.d., m.r.cs. [With Plate XXIX.] 408 



