SCIENCE. 



A. WEEKLY RECORD OF SCIENTIFIC PROGRESS, ILLUSTRATED. 



Four Dollars a Year. Two Dollars Six Months. 



One Dollar Three Months. Single Number Ten Cents. 



This journal was established on the 1st of July, 1880, for the purpose of providing a 

 first-class weekly scientific journal, and affording a rapid means of communication between 

 scientific men. 



Sixly-eight weekly numbers have been so far issued, and the editor has received letters of 

 congratulations and offers of support from gentlemen representing all branches of science. 



Volume one was completed on the 31st of December, 1880, and was provided with an 

 index of 5,000 references. The present volume (II) was commenced on the 1st of January, 

 1881, and will be completed on the 31^t of December. It will be a handsome volume of 

 seven hundred papers, having index with about 10,000 references. 



As a standard work of scientific reference the annual volume of " Science " will stand 

 unsurpassed, will be a valuable addition to every library, and as a scientific handbook 

 should be within the reach of every working scientist and practical man. 



The most convenient manner of taking " Science" is to subscribe, but it can be ordered 

 at your nearest news dealer. It then arrives every week presenting you with the current 

 scientific events, a series of original papers of the highest value, and interesting discussions. 



"Science" is of convenient size for binding, being of the same dimensions as Nature, and 

 as a work of reference can be handled with ease. 



Electro-plates have been taken of every number since the commencement ; new subscribers 

 need not therefore at once purchase the back numbers, as they can complete their sets at 

 any time. 



We have not made a habit of publishing congratulatory letters, as we have trusted to the 

 merits of the publication to secure support; the following unsolicited indorsements may 

 however be given, as representing the feeling of the scientific men of this country in regard 

 to this journal : 



"United States Senate Chamber, 

 "Washington, Sept. 19th, 1881. 

 " On my return to Washington, a few days ago, I found my file of 'Science' com- 

 plete, and have since gone through the numbers with much pleasure. I sincerly trust that 

 the publication is permanently established, for it has already made a name and place for 

 itself, as one which no working scientist would wish to be without. It seems to me to be 

 up to the times, as well as "up to the mark," and can therefore hardly fail to achieve the 

 lasting success which it obviously merits. "Elliott Cotjes." 



"Washington, Aug. 24th, 1881. 



" 1 am glad to be able to add my voice to those of others in congratulating you 



upon the success which has attended Science. I have no doubt that the periodical is 

 destined to occupy in America the same position held by Nature in England. 



"Alexander Graham Bell." 

 "University op Pennsylvania. 

 " 'Science' is a credit to all concerned. — George F. Barker." 



The Editorial Department is conducted by Mr. John Michels, with the valuable 

 assistance of many of the leading scientific specialists of the United States. 



OFFICES OF PUBLICATION. 

 Tribune Building (Room 17) New York City. 



European readers are directed to Mr. Deacon, 150 Leadenhall Street, London, Eugland. 



Sample copy sent free from chief office, orcan be ordered of any news dealer (Price ten centsj 

 in the United States. If any difficulty is found in obtaining "Science" send to heac' 

 quarters. 



