ABSTRACT OF PROCEEDINGS. 



XV, 



Fe 2 3 



= 3-83 



CI = 0-24 



FeO 



= 1-51 



C0 2 = 0-60 



CaO 



= 1-34 



P 2 5 ... ... = trace 



MgO 



= 0-32 





K 2 



= 4-10 



99-75 



Na 2 



=11-71 



Deduct O equiv. for CI 0-05 



MnO 



= 0-45 





so 3 



= none 



99-70 



The Kosciusko rock differs conspicuously from typical phonolites 

 in the following respects : — (1) low silica percentage ; (2) entire 

 absence of phenocrysts of sanidine. It is obviously a felspathoid 

 rock, and although its silica percentage allies it with the basalts, 

 its mineral constitution, chemical composition and low specific 

 gravity link it with the phonolites. As far as the authors are 

 aware, it is unlike any rock that has hitherto been described from 

 any part of the world. 



2. " Preliminary notes on the intermediary host of Filaria immitis, 

 Leidy," by Thos. L. Bancroft, m.b. Edin. 

 Filaria immitis, a worm-parasite of the dog, common throughout 

 the world, but more especially in the warmer parts, of from five 

 to ten inches in length ; the male being the smaller, is found 

 generally in the right ventricle of the heart, and in the pulmonary 

 artery. The so-called embryos, -gV in. x mroo in., are produced 

 in great numbers ; the late Dr. Spencer Cobbold taught that an 

 intermediary host was necessary to transmit the parasite from one 

 dog to another. Among others, Grassi, Sonsino, and J. Bancroft 

 endeavoured to discover this intermediary host. The dog-flea 

 (Pulex serraticeps), the various dog lice, and ticks were examined 

 but with negative results. The writer for thirteen years past had 

 endeavoured to find the intermediary host, examining Pulex 

 serraticeps; the common horse-fly, Stomoxys sp. ?; Culex vigilax, 

 Skuse — a day-flying mosquito ; the intestinal worm parasite of the 

 dog — the Anchylostoma or Dochmius trigonocephalus. The possi- 

 bility of metamorphosis being essential seemed doubtful, the embryo 

 might, it was thought, go through a cold stage for several days in 



