270 



NATURE 



[December 21, 191 1 



relisting bacilli in the dry state lose their power of taking 

 stains by the processes of Gram, Much, and Ziohl, but 



thi^ prncess is not the same for nil, sinro rolnmtion hv 

 Miiiir< method persists aftor th'- l>.-\rilli cf.-is.' tn si.iln i.\ 

 th'; othfr two npthods- \'. Commont ( in . ■ . !■ . 's of 

 the protohistorii , \.i)li(l and 



the stratigrapli'> "f i!i' iMt'; 



ill the north ol km h< 



inj» thf lowc 



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DIARY OF SOCIETIES. 



THURSDAY, December 21. 



LiNNEAN Society, at 8. — Some Annelids of the Thames Valley: Re-. 

 Hilderic Friend. — 'I'he Seedling Structure of Le^minosae: R-CCompto- 

 — The Intemodes of Calamites : Prof. Percy Groom. 



Institution of Mining and Metallurgy, at 8.— The Whim W. 

 Copper Mine, West Pilbara, North-West Australia : H. R. .Sleeman - 

 Emeralds: their Mode of Occurrence and Methods of Mioine a: 

 Extraction in Colombia : C. Olden. — The " Glen " Bismuth Mines, Nor 



gueensland : W. C. Walworth Pearce. — Notes on a Simple Meth-^ ? 

 iparating Rock from Stiff Clays : F. A. KiUik. 



CONTENTS. PA(,i 



Notes of a Naturalist. By E. B. P r 



Chemistry of Flour. By E. F. A 



The Colloidal State. By W. B. Hardy, F.R.S. . 

 The Analysis of Dyes and Dyed Materials. I; 



Prof. Arthur G. Green 



Municipal Engineering. By T. H. B 



Chemical Phenomena of Life. By W. D. H. 



Our Book Shelf : 



Letters to the Editor: — 



The Dislastefulness of Anosia phxippus. — A. M. 



Banta ; R. I. Pocock, F.R.S 



The Weather of 1911.— L. C. W. Bonacina : Dr 

 W. N. Shaw, F.R.S.; Right Hon. Sir Edward 



Fry, G.C.B., F.R.S ... 24: 



The Photography of Ha during Solar Eclipses.— 



Charles P. Butler 



The Nematodes of the Thames. — Rev. Hilderic 



Friend 



Microscope Stands 



Sleeping Sickness and Big Game ...... 



Exploration in the Department of Peten, Gua 



temala. (IHttstratcd.) By Alfred P. Maudslay . . zx- 

 The Ecology of Desert Plants. (/.■...,..;.'.') . . 249 

 Sir Joseph Dalton Hooker, CM., G.C.S.I., F.R.S. 249 



Notes 254 



Our Astronomical Column: — 



Mars 259 



Borrelly's Comet, I9ii( 259 



Spiral Structure in Nebu'.^ 250 



Permanent Designations for Recently Discovered 



Variable Stars 25 . 



Luminosities and Radii of Various Stars 259 



The Physical Society's Exhibition 259 



The Astronomical and Astrophysical Society of 



America 260 



Biometricians as Anthropologists 261 



Rock Crystal : its Structure and Uses. 



By Dr. Alfred E. H. Tutton, F.R.S 261 



The Value of Birds to Man. By James Buckland 265 



University and Educational Intelligence 266 



Societies and Academies 267 



Books Received 270 



Diary of Societies 270 



