422 Prize Quejiions and Proceedings of 



On the 21ft M. Biefter, a paper, in German, on the prin- 

 ciple of Socrates, that virtue and knowledge (<ppovv}<rt; et 

 tri^p;) are the fame thing. 



On the 28th M. de Verdy, an hiftorical chronology, in 

 French, of the Margraves of Brandenbourg, Anfpach, and 

 Bayreuth, defcended from the electoral houfe of Branden- 

 bourg, and who have exifted fince the year i486 to the pre- 

 fent time. 



On the 2d of Auguft M. Achard, a continuation of his ex- 

 periments on the germination of feeds, &c. 



On the 9th of the fame month the academy held a public 

 fitting, in which the following papers were read: — M. Achard 

 gave an account of the experiments he had made to determine 

 the influence of the coloured rays of light on the germination 

 of feeds, the green colour of plants and their decay, and 

 alfo to ascertain the different degrees of the affinity of oxygen 

 with luminous rays differently coloured. He fhewed, at the 

 fame time, the apparatus which he employed, as well as the 

 remits of his experiments. — M. Erman read a memoir on the 

 order of fucceffion in the houfe of Pruffia and Brandenbourg, 

 fince the reign of the branch of Hohenzollern. — Count de 

 Guyon read the fourth period of his hiftorical view of the 

 influence of women on the great events of their age and 

 country. The fitting was terminated by a memoir of the 

 marquis de Boufflers on literature and literary men, 



HOLLAND. 



The Batavtan Economical Society, authorifed by the Di- 

 rectory of the Batavian republic, has propofed the following 

 queflion as the fubje£t of a prize, to be anfwered either by 

 natives or foreigners : 



Are there any means hitherto unknown, and fufficiently 

 effective, to reftore fo completely, without the mixture of 

 pernicious ingredients, the tafle and fmell of ft inking and 

 corrupted water, as to render it a pure, cooling, and whole- 

 fome beverage J And what are thefe means ? 



A fetia- 



