January 27, 192 1] 



NATURE 



715 



(equal or supplementary) in certain fundamental angle 

 theorems. The appropriate principle of generality 

 was first arrived at by the author in a paper on 

 Simson's line read to the Edinburgh Mathematical 

 Society in May, 1914. Later consideration had made 

 it clear that the principles in question are basic to 

 the elementary geometry of the straight line, of 

 parallels, and of the circle, and are of wide applica- 

 bility in the geometrical theory dependent upon these. 

 — Dr. J. M. Baldwin : Giant and dwarf stars (see 

 p. 711). 



Sydney. 

 Unnean Society ol New South Wales, November 24. — 

 Mr. J. J. Fletcher, president, in the chair. — G. H. 

 Hardy : Revision of the Chiromyzini (Diptera). A 

 ^tudy of the genus Metoponia and its allies, following 

 (in Miss Irwin-Smith's studv of the larva of M. rubri- 

 .c^s, Macquart. — J. Mitchell : Some new Brachiopods 

 from the Middle Palaeozoic rocks of New South 

 Wales. From rocks of Upper Silurian age at Bown- 

 ing, Hatton's Corner, and near Molong, one genus 

 ;ind four species arc described as new. — Vera Irwin- 

 Smith : Nematode parasites of the domestic pigeon 

 iColumha livia domestica) in .Australia. The only 

 Nematode hitherto recorded from this host in .Aus- 

 tralia is Aacaridea columhae. Gmelin, from both New 

 South Wales and Queensland. Records of two further 

 species are added, and a new generic name is pro- 

 posed for Sirongylus quadriradiatus, Stevenson. — 

 J. H. Maiden : A few notes on the botany of Lord 

 Howe Island (sixth paper). This brief paper supple- 

 ments existing information in regard to hybrid 

 Howeas, which have been under cultivation in the 

 .Svdney Botanic Gardens for a number of years. 

 There are notes on indigenous plants hitherto un- 

 recorded, of which Adianium formosum, R. Br., is the 

 most important. A number of records of introduced 

 plants are also given. 



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Standard Method of Testing Juvenile Mentality by 

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The Journal of the Institute of Metals. Vol. xxiv.. 

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Great Britain in the Latest Age : From Lnisser 

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