VOL. XV., No. 93. .) NOVEMBER 1899. 
NATURAL 
“a, SCIENCE 
A MONTHLY REVIEW OF 
SCIENTIFIC PROGRESS 


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 ; : Paeee 15) 
By Dr. Georg Duncker. 
Tue Cereat Rust Propiem ; : apenas | 
By George Massee, F.L.S. 
PRoBLEM Of HONEYCOMB ’ : ; ‘ . Spoor 
By Charles Dawson, F.G.S., and S. A. Woodhead, B.Sc., F.C.S. 
Tae SuproseD ExistinG GROUND-SLOTH OF PaTAGONIA Sed 
By A. Smith Woodward. 
Fresh Facts . : ‘ f : : : . 3855 
Some New Books , : ; Se 
OBITUARIES ; ; ; . ; <5 Bae 
George Dowker. 
CORRESPONDENCE : é : ; ah ee 
News . ; d : say . ; ; 53; Ce 


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