388 



albinism, amongst these several Caladenias and Glossodia 

 niger. The President mentioned that the same colourless 

 condition occurs amongst the mollusca. The President 

 exhibited several shells; a very fine specimen of Pleurofo- 

 7Jiaria profeKs, in which the deep slit in the outer margin 

 was pointed out, and a M/iirchiso7ua lloydi and a Turrifella 

 runcianata; also, two blades of a pigmy whale (Neohalacua 

 marginata)^ from an animal found stranded on Thistle 

 Island. Miss Bundey showed several Jamaica mats, made 

 from the inner bark of the ''lace-tree." 



Ordinary Meeting, April 7, 1908. 



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

 chair. 



Ballot. — William Pope, Solicitor, as a Fellow. 



By-law.— It was proposed by Mr. Howchin, and car- 

 ried — "That by-law, section iv., paragraph 8, should in future 

 read 'September 15,' instead of September 30, in every year." 



Nominations.— J. P. V. Madsen, D.Sc, and W. Noel 

 Benson, B.Sc, both of the University of Adelaide. 



Exhibits.— Mr. J. G. O. Tepper, F.L.S., of the Museum, 

 two cases of butterflies, from Queensland, partly from Mr. 

 Bell's collection, and partly those presented to the Museum 

 by Mr. Samuel Dixon. Mr. J. McC. Black exhibited an 

 umbelliferous plant fAjnum Je/ptojjhyllum, North), found by 

 Mr. Griffith at the Finniss, and a grass (Isachne australis. 

 Brown) from Myponga. Dr. Pulleine exhibited a large 

 spider fPhlogms crassipes, Koch), from Orroroo, found in 

 the ground occupying cracks or other holes, the entrance of 

 which it covers with webbing. This spider is said to whistle, 

 but tliis characteristic has not been fully established. 



Papers. — "New Australian Lepidoptera of the Fami- 

 lies Noctuidce and Pyralidce," by A. Jefferis Turner, M.D.; 

 "The Ionization remaining in Gases after removal from the 

 Influence of the Ionizing Agent," by J. P. V. Madsen, D.Sc. ; 

 "An Experimental Investigation of the Nature of the 

 Gamma Rays," by Professor W. H. Bragg, M.A., 

 F.R.S., and J. P. V. Madsen, D.Sc. Dr. 

 Madsen, by means of diagrams on the blackboard, showed 

 how he had arrived at the conclusions set forth in his paper. 

 Prof. Bragg explained at some length that his and Dr. Mad- 

 sen's investigations of the gamma rays tended to show that 

 these rays are material, and that the "Ether Pulse Theory" 

 is no longer tenable. Prof. Rennie, D.Sc, drew the atten- 

 tion of the meeting to the important nature of the work that 



