SCIENCE. 



SCIENCE: 



A WEEKLY JOURNAL OF SCIENTIFIC PROGRESS, 



ILLUSTRATED. 



TERMS. 



One Year, - - - - - . - - Four Dollars. 



Single Number, ------- Ten Cents. 



Six Months, ------ Two Dollars and-a-Half. 



To Correspondents. 



All communications should be addressed to the Editor — box 3838, P. O., New York— with name and address of 

 writer, not necessarily for publication without consent. 



Scientific papers and correspondence intended for publication should be written legibly on one side only of the 

 paper. Articles thus received will be returned when found unsuitable for the Journal. 



Those engaged in Scientific Research are invited to make this Journal the medium of recording their work, and 

 facilities will be extended to those desirous of publishing original communications possessing merit. 



Proceedings of Scientific Societies will be recorded, but the abstracts furnished must be signed by the 

 Secietaries. 



Both questions and answers in " Notes and Queries " should be made as brief as possible ; an answer appearing 

 tc demand an elaborate reply may be written in the form of an article. 



To Subscribers. 



Terms of subscriptions for Sciknck will be $4 a year, payable in advance. Six months, $2.50. Single copies 

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Subscriptions forwarded by mail should be addressed to the Editor, Box 3838, P. O., New York, and Post-office 

 Orders made payable to "John Michels." 



To Advertisers. 



Terms for advertising may be obtained at the office of the Journal, 229 Broadway. 



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