168 
The following memoirs have been read 
in the year 1799. . 
On the 3d of fanuary, by ERMANN, a 
ninth memoir on the Errors of Hittory, 
and on their influence nyon biography. 
On the 1oth, by WitpENOoW, iome 
Remarks upon Fig trees. . 
On the 17th, by Gruson; on Camp 
Fortifications. 
On the 24th, at a public fitting, were 
read, 1- A Difcourfe on the Perpetual Se- 
eret; 2. Meierotto, on the Education of 
Frederic II. 3. Denina on thofe Principles 
of Economy, which contributed to the 
profperity of the ftate under Frederic IT. ; 
4. Ermann’s continuation of hts Eslogium 
on Sophia Charlotta; 5. Baftide on French 
Syilables; 6. Zollner on the Power of 
Mulic, intended as a prelude to Reichard’s 
concert ; at which were performed, 1. the 
Ode of Frederic EI. on the re eftablifhment 
of the Academy; 2. the Carmen Funebre, 
on the death of that Prince, by the Mar. 
quis ef Lucchefini. 
On the 31 ft Jan. ENGEL on the Advan- 
tage of enlightening Mankisd on fubje&s 
of Religion. 
On the 7th of February, DENINa on 
the Character of Infular Nations. 
On the 34th, WOLLNER on the Quel, 
tion prepofed in the Clafs of Phyfics, on 
Carbo, and its ufe in fumigating the 
earth. 
On the 21ft, BERNOUVILLI on the vari- 
ous Ufes and the great Utility of Maize. 
On the 28th, Nicoxtar on Infances of 
Apparitions, wi:h Pfychological Remarks. 
On the 7th of March, DE BuRGsporF, 
produced {pecimens of a coffee from the 
beta vulgaris. Bopsg alfo produced the 
third asd fourth fheet of his celeftial 
chart. 
On the rath, Mayer, on the Palinge- 
nefia, or Regeneration of Plants. 
On the 11th of April, De CastTiILLoNn 
on the Influence of Signs on the Formation 
of Ideas. 
On the 25th, AcHarD on the Cul iva- 
tion of Red Beet [Runkelrabe]. . 
On the 13th, Kuaprorn’s Chemical 
Analyfiz of Melilithos (Honigitein). 
On the 20th, TremBELey’s Integral 
Calculations for finite Differences. 
On the 27th, TELUER of the true efti- 
mation of the Learned Men of the prefent 
Time. 
On the 1 8to of Joly, Grufen onthe Re- 
folution of Equations in general, and par- 
ticularly of thofe of the fifth power. 
On the 25th, Engel on a rule of Sir I{aac 
Newton, and a continuafion of his me- 
moir on the Impenetrability of Light. 
Public Secieties. 
Proceedings of 3 
[ Sept. 1, 
On the rft of Auguft, Hirt on the va- 
rious Modes of Painting by the Ancients. 
On the 8th, which was a public affem. 
bly, 1. the perpetual fecretary read an 
oration; 2. Meierotto, an Eulozium on 
Rammler, from matcrials furnifhed by Nis ~ 
colai; 3. Ermann his tenth Memoir on the 
Errors of Hiftory, and their influence on 
the Science of Etymology; 4. De Burgs- 
dorf on the inventi-n of the deft Cotfee 
produced from the hufks of Red Beet; s. 
‘Zollner’s Supplement to his criticifms oa 
the Philofophy of the prefent Time. 
The phyfical clafs propofes for the year 
1801, the following queftion: * Does 
electricity aét on fubftances that ferment? 
If fo, how does it a&? Does it favour or 
retard fermentation ? and what advantages 
can be derived from the development of 
this fubject to improve the arts of making 
wine, beer, vinegar, and brandy? . 

TEYLERIAN INSTITUTIONG/HAARLEM. 
Oa the 29th of April, 1800, the direc. 
tors and members of that Inftitution held 
a meeting for the purpofe of deciding on 
the anfwers to the gueftion: «* What are 
the reafons for which moft nations have 
chofen metals, and efpecially gold and fil- 
ver, to be the reprelentative figns of value 
and riches? What are the advantages of 
this fo generally adopted medium of circu- 
lation, and what the difadvantages theie- 
with connected? Are there no other 
things that might, permanently, and with 
a beneficial effe€t to the public, be ufed 
in their ftead.”» The golden medal was 
adjudged toa diflertaticn in German, with 
the motto, ‘* I! faut fe refouvenir ici gue 
le fondement du pacte focial eft la propriété. 
FJ Ff. Roufeau. The author ts Profetior 
G. Sartorius of Goitingen. A Latin dif- 
fertation, with the motto, ‘* 4uro quid me- 
fius ?** and part of a French differtation, 
marked G**, which anfwered the latter 
part of the queition, were likewife de-~ 
clared worthy of being printed : and the di- 
rectors of the Society offera prize confifting 
of a filver medal to each of the authors, if 
with n three months they make themfelves 
known, ree 
It was likewife unanimoufly refolved by 
the Inficutien, that the prize could not be 
adjudged to any of the anfwers they had 
received to the queftion; “ What influence 
jas the republican form of government on 
the happine's or wretchednefs of the peo. 
ple ; and how far may this influence be 
elucidated and determined from the Hittory 
of the ancient Greek and Roman Repub. 
lics ?? This queftion is therefore again 
propoled 
