XXV111. ABSTRACT OF PROCEEDINGS. 



Nineteen volumes, 191 parts, 16 reports, and 6 pamphlets, 

 total 232, received as Donations since the previous meeting 

 were laid upon the table and acknowledged. 



THE FOLLOWING PAPERS WERE READ : 



1. "Law of Meteorological Phenomena," by A.G.Williams. 

 (Communicated by Prof. T. W. E. David, f.r.s., and 

 read by T. W. Keele, m. inst. ce. ) 



The President stated that the paper would be printed in 

 galley form and distributed to members prior to the next 

 meeting, so that it might be discussed. 



2. "A simple form of Sprengel Vacuum Pump," by J. A. 

 Pollock, Professor of Physics in the University of 

 Sydney. 



A modified short fall Sprengel vacuum pump of moderate 

 dimensions is described, in which the raising of the 

 mercury, necessary for continuous working, is effected by 

 evaporating the mercury at a lower and condensing it at 

 a higher level. 



Some remarks were made by Professor Liversidge. 



3. "Note on the Internal Structure of some Gold Crystals," 

 by A. Liversidge, ll.d., f.r.s., Professor of Chemistry 

 in the University of Sydney. 

 Professor Liversidge exhibited sections of isolated 

 crystals and groups of gold crystals, mainly octahedra and 

 rhombic dodecahedra, and photographs of the same before 

 and after cutting. The simple faces on polishing and 

 etching showed that the internal structure did not corres- 

 pond with the external ; e.g., in one case the rhombic planes 

 of an externally simple dodecahedron, were found to be 

 made up of two triangular faces; on these triangles there 

 were also faces of smaller crystals. Some showed a still 

 more complex structure. 



