SCIENCE 



Editoeial Committeb : S. Nbwcomb, Mathematics ; E. S. "Woodwabd, Mechanics ; E. C. Pickeeing, 



Astronomy; T. C. Mendenhall, Physics; E. H. Thueston, Engineering; lEA Eemsen, Chemistry; 



J. Le Conte, Geology; W. M. Davis, Physiography; O. C. Maesh, Paleontology; "W. K. 



Beooks, C. Haet Meeeiam, Zoology; S. H. Sctjddee, Entomology; N. L. Beitton, 



Botany; Heney P. Osboen, General Biology; H. P. Bowditch, Physiology; 



J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology ; 



Daniel G. Beinton, J. W. Powell, Anthropology ; 



G. Beown Goode, Scientific Organization. 



Friday, May 22, 1896. 



CONTENTS: 



A Successful Trial of the Aerodrome : S. P. Lang- 

 ley, a. Geaham Bell 753 



Tlie Development of Exogenous Structure in the Paleo- 

 zoic Lpcopods — A Summary of the Researches of 

 Williamson and Renault: David White 754 



37(6 Embankments of the River Poe : Feank D. 

 Adams 759 



Measuring Hallucinations: E. W. Sceiptuee 763 



Habits of Phrynosoma 763 



Lord Kelvinon the Metric System 765 



Notes on Agriculture and Horticulture : — 



The Prevention of Smut in Oats; Bacteriosis of 

 Carnations: Byeon D. Halsted 767 



Current Notes on Anthropology : — 

 Race and Disease ; Btuldha-like Figures in Amer- 

 ica and Elseiohere: D. G. Brinton 767 



Current Notes on Meteorology : — 

 Hurricanes in Jamaica; Ihe Climate of Venezuela; 

 A Quick Voyage across the Pacific ; A Tornado in 

 Neiv Jersey : E. De C. Waed 768 



Scientific Notes and News : — 



Annual Report of the Oeological Survey; Fish 

 Culture; Recent Chemical Progress; Tlie Marine 

 Biological Laboratory ; The Zoological Society of 

 London ; General 770 



University and Educational News 776 



Discussion and Correspondence : — 



Tlie Significance of Anomalies : Thoji AS Dwight. 

 'Progress in American Ornithology, 1886-95 :' J. 

 A. Allen. ' Wliat is Truth ? ' W. K. Beooks. 

 Three Subcutaneous Glandular Areas of Blarina 

 Brevicauda : Elliott Coues. Instinct : Wes- 

 ley Mills. Notes on the Perception of Distance : 

 H. M. Stanley. The 3Iammoth Bed at Morea, 

 Pa.: E. H. Williams, je. A Meteor: T. L. 

 Casey. X-Ray Photography by Means of the 

 Camera, Tlie Rotating Cathode: F. E. NIPHEE...776 



Scientific Literature : — 



Goods' s Principle's of Museum Administration : W. 

 N. ElCE. Landauer' s Spectrum Analysis : C.E.M.783 



Scientific Journals : — 



The Journal of Geology 785 



Societies and Academies : — 



Geological Conference of Harvard University : T. 

 A. Jaggae, Je. New York Academy of Sciences, 

 Section of Astronomy and Physics : W. Hallock. 

 Academy of Natural Sciences of Philadelphia : 

 Edw. J. Nolan. Northivestern tfniversity Science 

 Club : A. E. Ceook 786 



New Books 788 



MSS. intended for publication and books etr., intended 

 for review sliould be sent to the responsible editor, Prof. J. 

 McKeen Cattell, Garrison-on-Hudson, N. Y. 



A SUCCESSFUL TRIAL OF THE AERODROME. 



The editor of Science has received tlie 

 following letters containing an announce- 

 ment of great scientific and practical im- 

 portance: 



The Editor of Science — Dear Si7- : After 

 having published some investigations in 

 aerodynamics (' Experiments in Aerody- 

 namics ' and ' The Internal Work of the 

 Wind'), I have made further experiments 

 on the practical application of these conclu- 

 sions, in the construction of an actual 

 aerodrome or flying machine, upon a scale 

 sufficient to admit of the employment of a 

 steam engine of between one and two-horse 

 power. I have never given any account of 

 these experiments, as I have wished first 

 to attain such a complete control of 

 the flight as would insure its being auto- 

 matically directed in a horizontal course,, 

 in any desired azimuth ; but in view of the, 

 demands upon my time, which render it 

 uncertain how far I can continue my per- 

 sonal attention to the completion of this 

 object, I have yielded to the request of my 



