VOL. XV., No. 94. ly DECEMBER 1899. 
NATURAL 
JUAN 11 1900 
LAH L SCLEE.IN CE 
A MONTHLY REVIEW OF 
SCIENTIFIC PROGRESS 


CONTENTS 
PAGE 
Notes AND CoMMENTS . 3 : : : ; » 381 
Eliminated—Nature Studies—The Production of Parthenogenesis in a Sea- 
Urchin—The Record of a Great Work—Floreat Wood’s Holl—Asterionella— 
New Mice from St. Kilda— Alleged New Mice — British Mammals— 
Phylogeny of the Rodents—Phylogeny of Rust—Ferments in Fungi—More 
Sports—A Pontifical Plant—Neptuneopsis—A Note on Inheritance—The 
Cell as a Unit of Organisation—The Biological Corner of a Natural History 
Museum—Linné’s Type Specimens of Fishes—The Molluscan ‘“ Liver” so- 
called—Phylogenetic Senescence—Studies in Plant Morphology. 
TREES IN WINTER ; 399 
By P. Q. Keegan, LL.D. 
LAcEPEDE’s “ TABLEAUX . . . DES MAMMIFERES ET DES OISEAUX” 406 
By C. Davies Sherborn. 
An Extension oF THE MerrHop or TREATING VARIATIONS, WITH 
EXAMPLES AND CERTAIN CONCLUSIONS . 410 
By H. M. Kyle, M.A., B.Sc. 
A ZOooLoGist ON THE PRINCIPLES OF SCIENCE 423 
By F. A. Bather, M.A. 
On THE MULTINUCLEAR CELLS OF SOME GRASSES 434 
By Rudolf Beer. 
Fresh Facts 440 
Some New Books 442 
OBITUARIES 461 
CORRESPONDENCE 462 
NEws 464 
INDEX . 471 
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