SCIENTIFIC KEW?, 1871 



The diflribution of prizes fliould take piacr before the ter- Time of diftrl- 

 nn'nalion of the years in which they are (o be determined. The ""'"^S pr:a«» 

 priaes adjudged fliall be publilbed in the gazetlo. 



The author fliall receive his priae irum ihe admliiiflrative 

 committee of the Imperial Univerfity of Wihia, either in per- 

 fon or by deputy. The prize will be at his option, either a 

 gold medal or 100 golden ducats of Holland. 



The ProfelTors and honorary members of the Univerfity of Profeflbrs of 

 Wilna, cannot be candidates for the prizes. candida^esV" ^^ 



Revived Precipitates from alkaline Solutions of metallic Oxides. 



• M. Klaproth, a little before his deceafe, difcovered that Alkaline folu- 

 the folution of the metallic oxides in the alkalis, are as eafily oxTdes°prTcTpl"''' 

 precipitated in their metallic ftate, by the other melals foluble tated, in the 



in the fame alkalis, as are the acid folutions of thefe metals by 1"^^^'''^ ^^^* 



. . ,. . - . oy other m&tais. 



phofphorus : He has made a very ingenious application of this 



procefs to the analyfis of tin ores, according to the method 



which is defcribed in his Beiirae^e : In tliis operation tungftein 



is feparated from tungftate of ammonia, by the addition of zinc, 



in the form of black flakes. 



Experiments on falling Bodies, by M. Benzene tRc. 



M. Benzenberg, profefTor of phyfic and afironomy at Duf- A falling body 

 feldorp, publiQied, forae months ago, twenty-eight experi- 1!^'^'^'" ^^"^^ 

 ments made with balls well turned and pohflied, which were eaft, after paf- 

 made to fall from a height of 262 French {eQ{ : At a medium ^*"S through 

 they produced five lines of deviation towards the eaft, ac- 

 cording to the determination of the plumb-line, and the theory 

 gives four lines fix tenths. Thefe experiments were made in 

 the coal-mines of Schebufch ; they are an additional proof, 

 if it were neceflary, of the rotatory movement of the earth, 

 of which no one now doubts. The laft experiments, made at 

 Bologna by M. Guglielmini, gave nearly the fame refulls. 



Geography. 

 Great pains are taking in the condrufiion of an accurate Map of Hellaad. 

 map of Holland: The fame precautions have been u fed in 

 this bufinefs as in the meafurement of the degree of llie meri- 

 dian. M. de Zach has publifhed in his Journal the chart of 

 the triangles which have been completed : They are joined to 



thofe 



