276 PROCEEDINGS. 



(new design by Prof. Threlfall). Electric discharges in nitrogen 

 — vacuum tubes, &c. Experiment on the thermal changes accom- 

 panying diffusion, and a fundamental experiment of Electro- 

 dynamics. 



3. Engineering Laboratory (Prof. W. H. Warren, m. lust. c,E., 

 Wh. Sc.) — The collection of mechanical models was displayed, and 

 the large testing machine was used at intervals to demonstrate 

 the methods employed in testing metals, woods, also the tensile 

 strength of steel and steel-wire rope, Australian timbers, etc. 



4. Biological Laboratory (Prof. W. A. Haswell, m.a.,d.Sc. — ) 

 There were exhibited beneath numerous microscopes a large series 

 of Zoological and Botanical preparations, also series of loan 

 models by Dr. Zieglar of Freiberg, representing the brains of 

 various vertebrates. 



The University Hall. 



5. The Sydney Observatory (H. C. Russell, b.a., c.m.g., f.r.s., 

 Government Astronomer.) — Series of Star Photographs showing 

 Milky- Way. Photographs of Nebecula Major, Nebecula Minor, 

 and Orion. Photographs of instruments employed in the work. 



6. Department of Agriculture — -(H. C. L. Anderson, m.a., 

 Director.) — Models of standard fruits now in process of execution 

 as types of the true varieties. (N. A. Cobb, D.Sc, Ph.D., Govern- 

 ment Pathologist.) — Rust in Wheat ; parasitic Fungi ; parasitic 

 pests ; microscopes displaying slides of the above. (A. Sidney 

 Olliff, Government Entomologist.) — Insects showing transforma- 

 tion of various species. (Fred. Turner, f.r.h.s , Botanist to the 

 Department.) — Collection of Australian grasses. 



7. Department of Public Instruction — (J. H. Maiden, f.l.s., 

 f.c.s., Curator Technological Museum.) — -Model of first locomotive 

 steam engine, by Murdock, 1781 ; model of Formosan Catamaran; 

 specimens of W r ood-engraving by Norwegian peasantry ; six speci- 

 mens of Flora Artefacta [Jauch's], e.g.. ordinary artificial flowers 

 constructed on strict botanical principles ; lacquer hat of a 

 Japanese gentleman, not used for half-a-century past ; coloured 

 plates of Australian plants ; ornamental Australian timber. 



8. Technical Education Branch — (Prof. D. Codrington Selman, 

 A.M. Inst. C.E., Wh.Sc.,) — Model shewing the condition of invariability 

 of a trapezium under force action ; model of tower shewing the 

 economical substitution of a trapezium for two triangles as an 

 element in construction : these models illustrate the application 

 of a new principle of construction in lofty structures subject to 

 wind pressure. 



9. Department of Public Works (J. Barling, Under-Secretary.) 

 — Contract drawings for the Cowra Bridge. 



