ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 353 



GEOLOGY. 



On the Quartzite Pebbles of the Oldhaven (Blackheath) Beds 

 of the Southern Part of the London Basin. — H. A. Baker {Geological 

 Mag., Feb. 1920). — 1. The sarseu stones and pudding stones cousirlered 

 are cemented portions of sandy and pebblj lower Eocene strata. 2. The 

 TToolwich and Reading Ijeds have afforded one source of supply of these 

 stones. 3. The pebbles of quartzite and siliceous flint cong-lomerate 

 occurring in the Oldhaven (Blackheath) beds are rolled fragments of 

 sarsen and pudding stone deiived from the Woolwich and Reading 

 beds. Photo micrographic illustrations are included in the memoir. 



F. I. G. R. 



On the Petrography of the Millstone Grit Series of Yorkshire. — 

 A. GiLLiGAN (Geological Society, May 21, 1919). Since Sorby's work 

 on this subject, published in 1859, little has been done. The present 

 author has undertaken much microscopical work on the Millstone Grit, 

 and brings forward theories of great interest. F. I. G. R. 



Notes on the Extraneous Minerals in the Coral Limestones of 

 Barbados. — J. B. Harrison and 0. B. W. Anderson (Geological 

 Society, June 4, 1919). Characteristic representative specimens of the 

 fossil-reef corals, etc., were examined microscopically. A note on the 

 proportions of titanium oxide in the Barbados Oceanic Clays and in 

 some of the " Challenger " and " Buccaneer " deep-sea dredgings is 

 appended. F. I. G. R. 



On the Silurian Rocks of May Hill. — C. L Gardiner (Geological 

 Society, May 21, 1919). In the same paper, Dr. F. R. C. Reed de- 

 scribes a new species of Lichas from the Wenlock Limestone, and a new 

 variety of Calymene pajnilata. F. I. G. R. 



On the Dentition of the Pelalcdont Shark " Climaxodus." — 

 A. Smith WoODAVARD (Geological Society, June 4, 1919). 



On Syniogothyris Winchell, and Certain Carboniferous Brachio- 

 poda referred to Spiriferina d'Orhigny. — F. J. North (Geological 

 Society, Jan. 7, 1920). 



Some Microchemical Methods. — A. Brammall (Geological Mag., 

 March, 1920). The tests afforded by ferricyanide, ferrocyanide, and 

 thiocyanate solutions may be adapted to the microchemical investigation 

 of certain rocks in thin section. F. I. G. R. 



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