ALL RIGHTS RESERVED. 



Vol. I. No. 3. 



Ratui^al 



/^/^// 



SeiERGE: 



Jl ]\^oiithly I^eview of Scientific Progress. 



MAY, 1892. ,,,, g^ 



CONTENTS. 



PAGE 



Notes and Comments 161 



Private Collections— The Exploration of Matto Grosso, Brazil 

 — Ants and Mites— South American Extinct Mammalia. 



I. Dr. Weismann's Theory of Heredity Applied to Plants. By 



Rev. Professor George Henslow, M.A., F.L.S 171 



II. The Poisonous Secretion of Batrachians. By G. A. Boulenger, 



F.Z.S 185 



III. The Evolution of Fiat-Fishes. By J. T. Cunningham, M.A., 



F.R.S.E 191 



lY. Ticks. By Albert D. Michael, F.L.S 200 



V. Physical Geology in the Basin of the Colorado. By Alfred 



Marker, M.A., F.G.S. 205 



VI. Sigillaria and Stigmaria. By Sir J. William Daisson, C.M.G., 



F.R.S., and Professor W. C. Williamson, Lli.D., F.R.S 211 



Some New Books 217 



Some New Memoirs 227 



NeiHs of Universities, Museums, and Societies . . 230 



Obituary 235 



Observations and Correspondence 238 



London and New York: MACMILLAN & CO. 



PRICE ONE SHILLING NETT. 



