SCIENCE 



Sixth Year. 

 Vol. XI. No. 266. 



NEW YORK, MARCH 9, ^i 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



Entered at New York Post-Office as Second-Class Mail-Matter. 



Editorial ...... 



Major Powell on Evolution in Civilized Man. — The Logs of 

 the Great Raft. — The Work of the New York Academy 

 of Sciences. 



The National Electric Light Convention 

 Washington Scientific News. 



Maj. J. W. Powell on Evolution in Civilized Man 

 Ascertaining the Density of the Earth 

 Submarine Oil Springs in the Pacific 



Health Matters. 



Scarlet-Fever ...... 



Vaccination Statistics ..... 



Blood-Changes ...... 



112 

 n6 

 116 



"7 

 117 

 117 



Book-Reviews. 



Proceedings of the American Society for Psychical Research 



Letters to the Editor. 



Diamonds in Meteorites 



George F. Kunz 



118 



A Pseudo-Meteorite 



George F. Kurtz 



119 



Monocular Z/J-. Binocular Vision 



Joseph LeConte 



119 



The Scientific Swindler Again 



A. W. Butler 



119 



A Critique of Psycho-Physic Methods 



Dr. Franz Boas 



119 



American and Foreign Microscopes . 



IV. H. Seaman 



120 



Indian Wrist-Guards 



//. W. Haynes 



121 



Notes on the Geology of the Cascade Range 



Bailey Willis 



122 



Answers .... 





122 



The Science Company, Publishers, 4^ Lafayette Place, New York. 



London agent : G. E. Stechert, 26 Kino- IVzlliani Sf., Strand. 



"Consider the Lilies, how they grow." 



STANDARD WORKS ON BOTANY. 



ALPHONSO WOOD, Pn.D. 



Object Lessons in Botany. 



This work contains, first, a simple treatise on the science of Bot- 

 any, commencing with single and simple forms ; viz., the leaf, and 

 advancing by an imperceptible ascent to the higher combinations, both 

 in Forms, Growth, Life, and Classification of Plants. 



Introductory price, $1.00. 



The American Botanist and Florist. 



Of all manuals of Botany published in this countrv this is the most 

 suitable for class instruction as well as for private study. The first Part, 

 comprising Structural and Physiological Botany, is a concise treatise 

 free from all superfluous verbiage, containing all the principles and def- 

 initions of the science arranged in lessons of suitable length and fully 

 illustrated. The second part consisting of the Flora, for the conveni- 

 ence and availability of its analytical tables and synopses of genera, the 

 conciseness as well as completeness of its description of generi and 

 species, the vast number of species distinctively described and the typo- 

 graphical execution is unequaled by any other Flora in use. 

 Introductory price, $1.75. 



The Class Book of Botany. by 



ALPHONSO WOOD, Ph.D. 

 The Class Book is of the highest grade. It includes a full exposi- 

 tion of the principles of the science, together with a Flora, or descrip- 

 tion of all our plants, both native and foreign. In this work each and 

 every species is delineated in popular as well as in technical terms, while 

 a vast and comprehensive svstem of Analytical Tables pervading the 

 whole Flora, conducts the inquirer almost immediately to the point of 

 Jus research. 

 ^^ Introductory price, $2.50. 



W Teachers and School officers desiring- the best and freshest text books on the Science of Botan 

 any of these books will be sent for examination, postpaid, to any address in the United States on 



How to Study Plants ; or, Fourteen WeeksinBotany. 



By J. DORMAN STEELE (author of " A Fourteen Weeks' Course " 

 in each Natural Science), and ALPHONSO WOOD (author 

 of a series of Botanical Text-Books). 



This work has been prepared in response to repeated calls from 

 teachers for a Botany on the plan of the Fourteen Weeks' Series in Sci- 

 ence. The method of the book is entirely different from the ordinary 

 one. Instead of treating special topics, as leaves, roots, etc., and giv- 

 ing examples of each sort, an eitire plant, with root, stem, leaf and 

 flower, is portrayed and carefully analyzed. 



Introductory price, $1.00. 



Wood's Illustrated Plant Record, by 



ALPHONSO WOOD, Ph.D. 

 Tire value of botanical analysis as an educator, in developing the 

 faculty of attention, of discernment, reason, judgment, and generaliza- 

 tion, has never been, and cannot be, overestimated. 



Introductory price, 55 cents. 



The Botanical Outfit. 



Comprising all the utensils for the Gathering, Preservation, and 

 Analysis of Plants and Flowers. Every student of Botany should 

 possess an outfit. Interest in the study is thereby enhanced, and great 

 convenience afforded. It is sure to repay the investment. Outfit com- 

 prises : Tin Trunk, 14 x 11 in. Square; Tweezers, Wire Netting, 

 Straps, Knife, Plant Record, Microscope, Pressing Paper, Trowel. 

 Every article in this outfit is warranted first-class. Price, $8.00. 



Sample copies of 



A. S. BARNES 8z: COMPANY, 



III & 113 William St., New York, 234 & 236 Wabash Ave., Chicago. 



