SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE. 



Editoeial Committbe : S. Nbwoomb, Mathematica ; R. S. Woodwaed, Mechanics ; E. C. Pickbking, 

 Astronomy ; T. C. Mendenhall, Physics ; R. H. Thurston, Engineering ; Iba Remsen, Chemistry ; 

 Chaeles D. Walcott, Geology ; W. M. Davis, Physiography ; Henry F. Osboen, Paleon- 

 tology ; W. K. Brooks, C. Hart Mberiam, Zoology ; S. H. Scudder, Entomology ; C. E. 

 Bessey, N. L. Britton, Botany ; C. S. Minot, Embryology, Histology ; H. P. Bow- 

 ditch, Physiology ; J. S. Billings, Hygiene ; William H. Welch, Pathol- 

 ogy ; J. MoKeen Cattell, Psychology ; J. W. Powell, Anthropology. 



June 6, 1902. 



CONTENTS: 



The Ions of Electrolysis: Professor A. Crum 

 Brown 881 



The Botanical Society of Washington: Dr. 

 Herbert J. Webber 895 



The Mosquito Campaign in Neio Jersey: De. 

 JoH.N B. Smith 898 



Scientific Books: — 



Campbell's Botany: Professor Charles E. 

 Bessey. Sohmeil's Text-hook of Zoology: 

 Professor C. B. Davenport. Price's 

 Handbook on Sanitation 900 



Scientific Journals and Articles 902 



Societies and Academies: — 



The Regular Meetings of the Botanical So- 

 ciety of Washington: Dr. Herbert J. 

 Webber. The Geological Society of Wash- 

 ington: Dr. F. L. Ransome. Biological So- 

 ciety of Washington: F. A. Lucas. Neic 

 York Academy of Sciences, Section of 

 Anthropology and Psychology: Dr. R. S. 

 WoonwoRTH. Torrey Botanical Club: S. 

 H. BuRNHAM. University of Wisconsin 

 Science Club : C. K. Leith 903 



Discussion and Correspondence : — 



Northirestern America and Northeastern 

 Asia. A Criticism: Alfred H. Brooks. 

 Volcanic Dust: Dr. F. G. Wiechmank. 

 The Subdermal Mite occurring among 

 Birds: Professor Henry B. Ward. An 

 Interesting Invitation: Dr. W. J. Holland. 909 



Shorter Articles : — 



Henry Filhol, Paleontologist: H. F. 0. 

 Certain Properties of Nuclei: Professor 

 C. Bartts 912 



Quotations : — 



The Applications of Electricity in Great 

 Britain 914 



Current Notes on Meteorology: — 



Monthly Weather Review; Some Physio- 

 logical and other Effects of Sunshine and 

 Shade; Meteorological Annual of the Royal 

 Belgian Observatory: Professor R. DeC. 

 Ward : 914 



The West Indian Eruptions and Solar Energy 915 



Scientific Notes and News 916 



University and Educational News 919 



THE IONS OF ELECTROLYSIS* 

 The subject of electrolysis must always 

 have a special interest for the Royal Insti- 

 tution. It was here that Davy showed its 

 practical value by his brilliant discovery of 

 the metals of the alkalies and alkaline 

 earths; and it was here that Faraday laid 

 the foiuidation of the scientific discussion 

 of electrolysis; it was here that with his 

 sin^lar experimental skill and clearness 

 of insight he discovered and expounded the 

 laws of electrolysis which will always be 

 known by his name. It is therefore with 

 a good deal of diffidence that I stand here 

 to continiie the story. And there is much to 

 be said, for, like all good work, Faraday's 

 work has been fruitful, and in consequence 

 of it, as well as of the genius and skill of 

 subsequent investigators, we now know 

 much about electrolysis which Faraday did 

 not and could not know. 



The great difficulty left was that of the 

 mechanism of electrolysis. That the ca- 

 tion and the positive electricity travel to- 

 gether towards the cathode, and that the 

 negative electricity similarly travels with 

 the anion towards the anode, and that on 

 their arrival at the electrodes the electricity 

 is delivered to the metallic conductor and 

 the matter is set free to appear as the ion 

 itself, or to break up, or to act on the elec- 



* Lecture given before the Royal Institution of 

 Great Britain. 



