VOL. XV., No. 93. NOVEMBER 1899. 



NATURAL 



JAN .1 1 1900 



-1 SCIENCE 



A MONTHLY REVIEW OF 



SCIENTIFIC PROGRESS 



CONTENTS 



PACK 



Notes and Comments ....... 309 



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. 



Varl^tion-Statistics in Zoologv ..... 325 



By Dr. Georg Duncker. 



The Cebkal Rust Problem . . . .337 



By George Massee, F.L. S. 



Problem ov Honeycomb ...... 347 



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



Thk Supposed Existing Ground-Sloth of Patago.via . . 351 



By A. Smith Woodward. 



Fresh Facts ........ 355 



Some New Books . . . . . . .357 



Obituaries ........ 370 



George Dowker. 



Correspondence . . . ■ .371 



News . . . . • • • • 373 



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