CONTENTS. 



VOLUME XXI. 



Page* 

 Officers for 1887-88 vii. 



Act of incorporation... ... ... ... ... ix. 



Bules, List of Members, &c ... ... ... ... xiii. 



Art. I. — President's Address. By Chr. Eolleston, C.M.G-. ... 1 



Art. II. — Eecent Work on Flying-machines. By L. Hargrave. 



(Six Plates) 19 



Art. III. — Some New South Wales Tan-substances, Parti. By 



J. H. Maiden, F.E.G.S 27 



Art. IV. — Eemains of Plesiosaurus. By E. Etheridge, Jr., F.G.S. 57 



Art. V. — New Electric Storage Battery. By David Miller ... 57 



Art. VI. — Notes on the Experience of other Countries in the 

 Administration of their Water Supply. By H. G. 

 McKinney, M.E., M.I.C.E 60 



A^t. VII.— Autographic Stress-strain Apparatus. By Prof. 



Warren, M.I.C.E. (One Plate) 74 



Art. VIII. — Notes on some Inclusions observed in a specimen of 



Queensland Opal. By D. A. Porter, Tamworth. (One Plate) 81 



Art. IX. — Some New South Wales Tan-substances, Part 2. By 



J. H. Maiden, F.E.G.S 82 



Art. X. — The Influence of Bush Fires in the Distribution of 



Species. By Eev. E. Collie, F.L.S 103 



Art. XL — A District Hospital : its Construction and Cost. With 

 a description of a new method of constructing Iron Build- 

 ings. By J. Ashburton Thompson, M.D. Brux., San. Sci. 

 Cert., Cantab. Chief Medical Inspector of the Board of 

 Health of New South Wales. ( Three Plates) , 111 



Art. XII. — Origin and Mode of Occurrence of Gold-bearing Veins 

 and of the Associated Minerals. By Jonathan C. B. P. 

 Seaver, C.E., F.G.S., &c. (Six Plates) 125 



