INCANDESCENT LIGHTING 



ON 



ARC LIGHT CIRCUITS. 



THE BROWN AUTOMATIC CONVERTER 



will supply and take care of ten to twelve 16 c,p. incandes- 

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Can be used with any make arc dynamo. 



Any number of lamps can be turned on or off without 

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Invaluable to lighting companies as a means by which 

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Address 



THE BROWN ELECTRIC COMPANY, 



400 Wood Street, Pittsburgh, Pa. 



PRIZES OFFERED BY THE BOSTON 

 SOCIETY OF NATURAL HISTORY. 



SCIENCE 



AN ILLUSTRATED WEEKLY JOURNAL. THE SCIENCE 

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SCIENCE appears every Friday. Volumes begin in July and January. 

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THE WALKER PRIZES, APRIL, 1886. 



The Society offers a first prize of from $60 to $100, and 

 a second prize of $50, for the best memoirs in English, on the 

 following subject: 



" Original unpublished investigations on the embryology of 

 any plant." 



The essays are to be sent to the Secretary of the Society, 

 on or before April 1, 1886, accompanied by a sealed envelope, 

 endorsed with a motto corresponding to one on the essay, 

 containing the name and address of the writer of the essay, 

 which must not, in any way, be apparent in the manuscript. 



/ Boston, Mass. EDWARD BURGESS, Secretary. 



HORSFORDS 



Acid Phosphate 



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Universally prescribed by physicians. 

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It makes a delicious drink with water and sugar only. 



Prices reasonable. Pamphlet mailed free. 



Rumford Chemical Works, Providence, R. I, 

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838 Broadway . . . NEW YORK, 



FOREIGN BOOKSELLERS AND IMPORTERS. 

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An eminently practical new method for learning the German lan- 

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webster's diqjiqnary 



CONDENSED 



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Fntf-rcd at the Post-office in New York as second-class mail matter. Copyright, 



by 7 he Science Company . 



