ABSTRACT OF PROCEEDINGS. xix. 



The following gentleman was duly elected an ordinary 

 member of the Society : — 



Alex. Greenlaw Hamilton, Lecturer on Nature Study, 

 Teachers' College, Blackfriars. 



Fourteen volumes, 228 parts, 16 reports, and 4 maps 

 were laid upon the table. 



THE FOLLOWING PAPERS WERE READ I 



1. " Some Crystal measurements of Chillagite," by Miss 



C. D. Smith, b.Sc, and Leo A. Cotton, b.a., b.Sc 



The paper was read by Mr. Cotton, and Dr. Woolnough 

 offered some observations. 



The crystals examined were presented to the Sydney 

 University by Mr. Ullmann, of the Christmas Gift Mine, 

 Chillagoe. Analyses by the Queensland Department of 

 Mines show the presence of lead, molybdenum and tungsten . 

 The crystals are therefore related to both stolzite and 

 wulfenite. Crystal measurements show distinct differ- 

 ences from both of these minerals. The result of these 

 measurements and the evidence of the analyses suggest 

 that the crystals may belong to a new mineral species. 

 This cannot however be certainly established on the 

 present data. The name Chillagite has been adopted to 

 distinguish the new crystal combination. 



2. " The occurrence of the genus Spirangium in the 



Hawkesbury Series," by W. S. Dun. 



Mr. W. S. Dun read a preliminary note on the discovery 

 of Spirangium in the Wianamatta Shales at Brookvale, 

 near Manly. 



Spirangium is a fossil, the interpretation of which is a 

 vexed question. It is usually regarded as the fructification 

 of some plant, and consists of a stalked elongated cone, 

 formed of tetragonal scales arranged spirally and termin- 

 ating in a long spine. It has been regarded as the e'gg of 



