SCIENCE 



Sixth Year. 

 Vol. XI. No. 278. 



NEW YORK, June i, li 



Single Copies, Ten Cents. 

 J3.50 Per Year, in Advance. 



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



AfaJ> of the Yellowstone Park. 



Editorial ...... 



The New York Schools once more. — The Resignation of Pro- 

 fessor Levering at Harvard. 



The Yellowstone National Park 



A New Science of Mind . Joseph Jastroiu 



Aboriginal Architecture in the South-west 



Explorations in Greenland 



Scientific News in Washington. 



Collections of Jewels and Precious Stones 



A Proposed Steel 'Vacuum' Balloon 



Death of Prof. E. B. Elliott .... 



The Tape- Worm in Sheep . . . . ' , 



Electrical Science. 



Long-Distance Telephone-Lines .... 



255 



256 

 257 

 259 



260 

 260 

 261 

 261 



Possibilities and Limitations of Chemical Generators of Elec- 

 tricity ...... 



The Seel Incandescent- Lamp Filament 



The Carriere Accumulator . . . . 



Health Matters. 



Wear and Tear of the Medical Profession . 



Carpet-beating in Paris . . , . . 



Book-Reviews. 



Discovery of the Origin of the Name of America 

 Report of the Dairy Commissioner of the State of New Jersev, 

 1S87 . . . . . . ' . 



American Fishes . . . . . 



Notes and News . . . . . 



Letters to the Editor. 



262 

 263 

 263 



263 

 264 



264 



264 

 265 



265 



Fayette County Moteorite . 

 An Unusual Auroral Bow . 



Ward &> Howell 

 D. S. Kellicott 



266 

 266 



The Scie7ice Company, Pttblishers, /j.'/ Lafayette Place, New York. 



London agent: G. E. Stechert, 26 King William St., Strand. 



BRADLEY'S ATLAS OF THE WORLD. 



A Complete American and Forei^\^c?^tlas, with isometric index to maps. 



112. Iv. C^.. and Plans. 



Folio 



Wm. M. Bradley & Bro., 



•^ 



From Rev. James McCosh, D.D., LL.D., 



President of Princeton College. 

 It is very full and comprehensive, and is more minute in giving the 

 names and localities of places in all countries than any atlas I have seen. 

 It should be in all our libraries and in our large offices. 



From William Libbey, Jr., 



Prof. Physical Geography in Princeton College. 

 It gives me pleasure to add my testimony to the value of Bradley's 

 Atla-^, the first American work of the sort worthy of the name. I have 

 examined it closely and find it excellent in every way. The informa- 

 tion it contains is drawn from the latest and best authorities, making it 

 easily the most reliable as it is the most recent work in its department 

 in existence. It will take tiie lead among Geographical Atlases. 



From J. M. Buckley, D.D., 



Editor of Christian Advocate. 

 This Atlas approaches and may be said to attain, up to the present 

 date, the ideal of an atlas. We have perused it with reference to the 

 recent exploring expeditions sent to the Polar Seas, Mexico, and Rus- 

 sia ; and the maps of Switzerland. Norway and Sweden, and the Dark 

 Continent, and have placed it in the editorial library as something 

 greatly to be desired and likely to be frequently consulted. 



,^6 Arch St., Phila., Pa. 



- % — 



Frv m Prof. Geo. H. Cook, 



State Geologist. 

 The best work of the kind that I know of. It is up to'jthe times in 

 its matter and its maps are admirably prepared. I heartily commend it. 



From John H. Vincent, D.D. 



I have examined and subscribed for the mammoth volume of maps 

 published by Wm. M. Bradley & Bro. It is a treasure house of infor- 

 mation, Geographical, Historical, and Statistical. jj; I heartily commend 

 it to persons " who want the best." 



From the late General Wm. B. Hazen, 



Chief Signal Officer, Washington, D.C. 

 Your Atlas is just what is needed at home and abroad. 



From Gen. Fitz John Porter. 



The volume is very valuable. I have not seen a better set of maps. 



From Ellis A. Apgar. 



Late State Supt. of Public Instruction. 

 I have examined Bradley's Atlas of the World, and it affords me 

 pleasure to say that it is the best published in this country. 



And a large list of prominent educators, including Jas. H. Mason Knox, D.D., President of Lafayette College ; Prof. B. 

 Youngman, of Lafayette College ; Rev. Noah Porter, D.D. , LL.D., President of Yale College; Edw. H. Magill, A.M., 

 President of Swarthmore College ; Wm. W. Patten, D.D., LL.D., President of Howard University ; Merville Edwards 

 Gates, Ph.D., LL.D., President of Rutgers College ; W. I. Curtis, Principal of Hillhouse High School, New Haven, Conn., 

 M. A. Newell, Principal State Normal School, Baltimore, Md. ; Edw. S. Ellis, Superintendent of Public Schools, Trenton; 

 N. J., &c., &c. 



