186 Imperial Academy of Sciences at St. Peterslurgh. 



formancc. The:;e essays (No. 5 and No. 6.) are agreeable to 

 the principal condition stated in the notice, inasmuch as they 

 contain a great number of new experiments on the effects 

 and properties of liglit, and a judicious application of those 

 which, though already known, were repeated whenever they 

 appeared to the author doubtful. Both pieces are executed 

 upon apian wisely conceived, expressed with clearness, and 

 arranged in a sufficiently systematic order. On the other hand, 

 in each were found some incoherent and contradictory con- 

 clusions, a-; also propositions hazarded without sufficient 

 proof, besides some errors and obscure passages : but as 

 these imperfections were overbalanced by researches of great 

 merit, the academy? without acceding to every assertion 

 of the authors, have nevertheless thought it their duty to di- 

 vide the prize betveen the authors of No. 5. and No. 6. 

 {hinking them worthy of encouragement and honourable 

 reward. 



On opening two of the sealed notes, doctor Henry Fre- 

 derick Link, professor of physic at the university of Ros- 

 tock, ^^ as found to be the author of No. 5. and Mr. Placi- 

 dus Heinrick, professor of physic and mathematics to the 

 Abbey de St. Emeran, at Ratisbon, the author of No. 6. 

 The notes of the remaining tracts were burnt without being 

 opened. 



When the academy made public the notice in which 

 the marine department proposed a prize on the question 

 concerning the resistance of fluids, tliey engaged to pub- 

 lish also t >e judgment which that department, in conjunc- 

 tion with the academy, should make on the memoir present- 

 ed cnnfo mab'y with this engagement. The academy an- 

 nounce by t' e present, the receipt of these memoirs : viz. 



No. ]. with motto, " Sit modus lasso maris et viarum 

 mil'ticpqiie." 



No. 2. " Prccstat naturce voce doceri, quam ingenio suo 

 mpere." 



No. 3. " England and France agree." 



(The last of which came after the term) — None were found 

 to satisfy all the conditions of the problem ; but as the tract 

 No. 2. exhibits a new theory, which, though not established 



upon 



