221 



Papers. — "Description of a Disturbed Area of Cainozoic 

 Rocks in South Australia, with Remarks on its Geological 

 Significance," by W. Howchin, F.G.S. Mr. E. V. Clark, 

 JB.Sc, the original discoverer of this area, made some re- 

 marks on the subject. "Note on the Occurrence of Trichina 

 spiralis in South Australia," by E. A. Johnson, M.D. This 

 important parasite occurring in the human muscular tissue 

 has (according to the author) been recorded only three times 

 in Australia. 



Ordinary Meeting, May 2, 1911. 



The President (J. C. Verco, M.D., F.R.C.S.) in the 

 chair. 



A motion was brought forward to alter the evening of 

 meeting from the first Tuesday to the second Thursday in the 

 month. This was sent as a recommendation to the Council. 



Exhibits. — Mr. E. Ashby exhibited birds from Anson 

 Bay, Northern Territory, and from Mannum, River Murray, 

 South Australia. Those from the former place included 

 Ptilinopus ewing, Pitta iris, Graucalus mentalis, Chalcophaps 

 occidentalis, Chibia bracteata, P eizorhynclius nitddus, 

 Rhiphidura isura, R. concinna, and R. fulvifrons, as well as 

 several honey-eaters. Mr. Howchin exhibited foraminifera 

 from Rottnest Island, collected by Dr. Verco. He remarked 

 that one of these, Orbitolites complanata, has a diameter of 

 from J in. to f in. in tropical seas. It used to live in our 

 gulfs and is found sub-fossil in the Port River beds. It also 

 occurs in the Miocene at Hallett Cove, reaching nearly 1 in. 

 in diameter. Mr. Howchin also exhibited photographs of 

 granite boulders from Palmer, South Australia, showing the 

 nature of weathering in granite, and described how the Cor- 

 nish tors and cheese rings are formed by the weathering of the 

 rock into boulders. Mr. J. G. O. Tepper exhibited photo- 

 graphs and specimens of metamorphic rocks obtained at 

 Barossa, South Australia. Mr. H. G. Smith, F.G.S.,, As- 

 sistant Curator and Chemist at the Technological Museum, 

 Sydney, and joint-author of the "Eucalypts of Australia," 

 made some remarks on the economic value of eucalypts. He 

 stated that many tons of terpene oils were being used weekly 

 in the separation of sulphide ores. For medicinal purposes 

 alone the extraction of eucalyptus oils would never become a 

 great industry. At present the medicinal eucalyptus oil trade 

 is about £50,000 yearly. Mr. Smith discussed the venation 

 of the leaves of eucalypts as an indication of their qualitative 

 oil content, and pointed out that there were three main 

 groups, and nearly all eucalypts could be placed in one or 

 other of these groups. The leaf venation and chemical con- 

 stitution of the oil could be correlated. Professor Rennie, 



