VOL. XV., No. 93. 



NOVEMBER 1899. 



NATURAL 



SCIEN 



A MONTHLY REVIEW OF 



SCIENTIFIC PROGRESS 



<^1: 







CONTENTS 



Notes and Comments ....... 



Disturbing the Balance of Nature — Notes on American Mammals — American 

 Plant-Notes — A Rock out of Place — Beeren Eiland — The Difficulties of the 

 Australian Museum — The Antarctic in the Arctic — Regeneration in Orthop- 

 tera — Diastataxy — Immunity Acquired before Birth — Eel Poison and 

 Cellular Immunity— Venom of Vipers. 



Variation-Statistics in Zoology ..... 



By Dr. Georg Duncker. 



The Cereal Rust Problem ...... 



By George Massee, F.L.S. 



Problem ok Honeycomb ...... 



By Charles Dawson, F.G.S., and S. A. Woodhead, B.Sc, F.C.S. 



The Supposed Existing Ground -Sloth of Patagonia 

 By A. Smith Woodward. 



Fresh Facts . 



Some New Books 



Obituaries 



George Dowker. 



Correspondence 



News . 



PAGE 



309 



325 



337 



347 



351 



355 

 357 

 370 



371 

 373 



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