VOL. XV., No. 90. 



AUGUST 1899. 



NATURAL **~ 



Iijj LIDRARY 





SCIENCE 



A MONTHLY REVIEW OF 



SCIENTIFIC PROGRESS 



CONTENTS 



PAGE 



Notes and Comments . . . . . . .81 



Against the Tide— A Rare Rotifer — Does the Organism Repeat Itself? — 

 Nephrite — The Ordeal hy Fire — American Species of Peripatus — Wearing of 

 the Green — Brevis esse laboro, obscuris fio — The Parietal Eye — The Expan- 

 sion of the Empire of Ribbed Toads — Degrees of Protective Adaptation — An 

 Entomological Exhibition — At Last ? — Colours of Northern Monocotyledons 

 — The Proper and Improper View of Heredity — Darwin's Doggedness — 

 Dispersal of Seeds — Reformed Nomenclature ! — Science and Conduct. 



Some Considerations Concerning Symmetry . . . .97 



By Professor R. J. Anderson. 



The Flora op the Alps . . . . ... 109 



By Professor Alfred W. Bennett, M.A., B.Sc, V.P.R.M.S. 



The Scope of Natural Selection . . . . .114 



By J. Lionel Tayler. 



Stray Impressions op the Marine Invertebrates of Singapore and 



Neighbouring Islets . . . . .130 



By F. P. Bedford, M.A. 



A Theory op Sleep . . . . . . .134 



By Professor A. L. Herrera. 



Fresh Facts . . . . . . . .140 



Some New Books . . . . . . .142 



Obituary . . . . . . . .151 



SirW. H. Flower, K.O.B. 



News . . . . . . . . .154 



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