300 SCIENTIFIC NEWS. 



bly neceflfary. The memoirs forwarded to the academy mull 

 be written in a diftlndl legible charadler, either in the French 

 EngliOi or Rufllan language. 



(Signed in the original) PAUL TCHITCHAGOFF. 



Terms and con- In the invitation accompanying this program, the Academy 

 ditions for re- requires men of fcience who intend to make application for this 

 xsivingme- ? ,. r . ■ • , , r . e 



ipoirs. prize, to addrels their memoirs to the perpetual fecretary of 



that body, before the ift of July, 1806, and that the writer 

 (hould clear the port charges as far as the regulations of their 

 refpe6tive countries will allow. The cuftomary mode of mark- 

 ing the memoirs with a device or motto, and fending at the 

 fame time a fealed letter, having the fame device, and con- 

 taining the name and reCdence of the author, is alfo to be 

 adopted in the prefent in fiance. The memoirs will be ex- 

 amined before the expiration of the term of concurrence, by 

 the Department of the Marine and by the Academy j the lat- 

 ter of whom will publilh the judgment they fliall adopt, and 

 the Department of the Marine will crown by the payment 

 of the prize, the labours of that author who (hall have fatis- 

 fied the conditions of the program. 



Prize concerning Light, propofed by the Imperial Academy of 

 Sciences for the Year 1806. 

 Prize concerning After an introdudion, in which a concife ftatementis given 

 light. of two theories refpecling the nature of light, the one afcribed 



The tifual the- to Newton, which fuppofes light to confift in the emanations 

 ories that light of matter from luminous objecls, and the other afcribed to 

 tef'^'^or merT^ ' Eu^cr, which deduces the effe6ls from vibrations of a peculiar 

 undulation of aelaftic fluid, — they proceed to ftate rather more fully a chemical 

 fluid}— hypothefis of Lavoifier, who not only confiders light as caufed 



— jr it is a che-by a peculiar matter, but alfo that this matter is fubjed to the 

 mical principle, gjeclive attradions, fo as by its combinations and difengage- 

 ments to produce an extenfive feries of phenomena, which 

 Five hundred are thus accounted for. It is principally with a view to de- 

 roubles, velope this laft hypothefis that they have propofed a prize of 

 ^•'" '° ° 500 roubles (£ll2 10 0.) 



The qucftion. *' For the moft inftru6live feries of new experiments on 

 light, confidered as matter; on the properties which may with 

 juftice be afcribed to it; on the affinities which it Ihall appear 

 to have with other bodies, whether organic or inorganic, and 



