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. 



Editoei^l Committke : S. Nbwcomb, Mathematics ; E. S. Woodwaed, Meohanioa ; E. C. Pickeeinq, 

 Astronomy ; T. C. Mbndenhall, Physios ; E- H. Thurston, Engineering ; Iba Remsen, Chemistry ; 

 Charles D. Walcott, Geology ; W. M. Davis, Physiography ; Henet F. Osboen, Paleon- 

 tology ; W. K. Brooks, C. Haet Mbbbiam, Zoology ; S. H. SotrDDBB, Entomology ; C. E. 

 Bebsky, N. L. Beitton, Botany ; C. S. MiNOT, Embryology, Histology ; H. P. Bow- 

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

 Pathology ; J. McKben Catiell, Psychology. 



Friday, January 16, 1903. 



CONTENTS: 

 The American Association for the Advance- 

 ment of Science: — 

 On the Physical Constitution of the Planet 



Jupiter: Professob G. W. Hough 81 



The Origin of Terrestrial Plants : Peofessob 



Douglas Houghton Campbell 93 



Section A, Mathematics and Astronomy: 

 Pbofessob Chaeles S. Howe 104 



Scientific Books: — 



Ziegler's Veher deti derzeitigen Stand der 

 Descendenzlehre in der Zoologie: Peofessob 

 William A. Loot. Oeuvres Completes de 

 J.-G. Galissard de Ma/rignac: Peofessob 

 Theodoee William Richaeds Ill 



Societies and Academies: — 



The America^ Mathematical Society: Peo- 

 fessob F. N. Cole. The New Mexico Acad- 

 emy of Science: Peofessob T. D. A. Cock- 

 eeell 112 



Discussion and Correspondence: — 



Marine Animals in Interior Waters: Peo- 

 fessob H. M. Smith. A Brilliant Meteor: 

 Peofessob Aethue M. Miller. An Appli- 

 cation of the Law of Priority: Nathan 

 Banks 114 



Current Notes on Physiography : — 



Glacial Channels in Western New York; 

 The Scenery of England; Terminology of 

 Moraines; New Norwegian Maps: Peo- 

 fessob W. M. Davis 115 



Botanical Notes: — 



More Books on Trees: Peofessob Chables 



E. Bessey 117 



Scientific Notes and News 118 



University and Educational News 120 



MSS. Intended for publication and books, etc., intended 

 for review stiould be sent to the responsible editor, Pro- 

 fessor J. McKeen Cattell, Garrison-on-Hadson, N. Y. 



ON THE PHYSICAL CONSTITUTION OF THE 

 PLANET JUPITER* 



The planet of Jupiter was one of the 

 first objects to which the telescope of 

 Galileo was directed, and the satellites of 

 the planet were among the earliest dis- 

 coveries made by that instrument. In 

 1630 the telescope had been constructed 

 with sufficient power to show the great 

 equatorial belt. Previous to the begin- 

 ning of the eighteenth century the prin- 

 cipal phenomena seen on the surface of 

 Jupiter had been observed, and the time 

 of rotation and position of the axis of 

 the planet ascertained. Notwithstanding, 

 however, the great mass of facts which 

 have been collected from observations ex- 

 tending over a period of 200 years, yet 

 up to the present time no theory of the 

 physical condition of the surface has been 

 advanced which has met with universal 

 acceptance. In order that the subject may 

 be more clearly understood it will be well 

 to state briefly the salient features pre- 

 sented to the eye of the observer. The 

 disk of Jupiter appears as an ellipse hav- 

 ing axes in the ratio of 14 to 15, the longer 

 axis lying in the direction of the planet's 

 equator. The equatorial diameter is about 

 89,000 miles. 



* Address of the chairman of Section A, Mathe- 

 matics and Astronomy, and vice-president of the 

 American Association for the Advancement of 

 Science. Read at the Washington meeting, De- 

 cember 29, 1902. 



