Royal Academy of Sciences at Berlin. 179 



regard to the motion of rivers and ftreams, by Trembley. 

 I4lh, On the length of a pendukim to fwing feconds at 

 Berlin, by ProfefTor Burja. 21 ft, Third differtation on the 

 impenetrability of light, by ProfefTor Engel.. 28th, Second 

 diflertation on the art of clothing mankind, and on clothing 

 confidered under different points of view; by Von Goyon. 



December ^th. On eatable mufhrooms, by Mayer. I2th^ 

 Obfervations on the attractive force of fpheroids, by Trem- 

 bley. 19th, On the principles of metaphyfics, by Ancillon, 



January 9th, 1800. Second difTertation on the prize quef- 

 tions of the clafs of the fciences fince the year 1772, by 

 Baron Von Chambrier. i6th, Phyfical obfervations on the arts 

 of defign, by Von Burgfdorf. 23d, Obfervations on the cal- 

 culations refpefting the duration of marriage, and the num- 

 ber of married perfons ; by Trembley. 30th, This being a 

 public fitting, Merian the direiStor, as perpetual fecretary, 

 delivered an oration in French. The following papers, alfo, 

 were read : Confiderations on the principal definitions in the 

 fciences, by Ancillon : Hiflorical panegyric on queen Sophia 

 Charlotte of Pruffia, by Erman : On yeflerday, to-day, and 

 to-morrow, by Baflide : Further obfervations on drefs, by 

 Von Goyon. 



February 6th, On the proper meaning of the term a great 

 man, by Teller. I3ih, On the ufe of perukes among the 

 ancients and in the middle ages to the prefent period, and 

 on the origin of tlie word peruke; by Nicolai. 20th, Exa- 

 mination of the red water of a lake near Lubotin in-South 

 Pruffia, by Profeffor Klaproth. 27th, On different kinds of 

 maize, by ProfefTor Bernoulli. 



March 6th, On fpace, by Baron Von Chambrier. 13th, 

 On the origin of the names of nations, countries, rivers, 

 cities, and families; by the Abbe Denina. 20th, On eatable 

 muflirooms, fecond difTertation. 27th, ProfefTor Bode pre- 

 fcnted the fourth number of his Celeftial Atlas. 



April 3d, DifTertation on free-will, by Von BoufBers. 

 S4th, On the Circenfian games, by Mejerotto. 



May ifl, Delcription of a new Eaft Indian plant called 

 Pifonia Georgiana, by ProfefTor Wildenow. 8lh, On fome 

 new matheinalical difcoveries, by Profeifor Buija. 



A a iJ ELEC- 



