SCIENTIFIC NEWS. 143 



of heat, which are neceflary to be known in order to form a nagement of 

 • / „ / , in -ii ju combuftibles, 



right judgment of the methods of ufing combultibles ; and how &c> 



can we, according to thefe principles, improve the fires for 



warming apartments and ftoves for kitchen ufe, in order to 



fave as much as poffible the combuftibles in ufe -in this 



country ?" 



. The above was propofed in 1801. 



5. " What is adually known refpefting the caufes of the ftagnant water, 

 corruption of ftagnant water, and is it poffible to deduce from 

 what is known or may be proved by decifive experiments, 

 what are the moft effectual and fafe means to prevent the cor- 

 ruption of ftagnant waters i" 



Prepared in 1801. 



The prize for each queftion is a gold medal of thirty ducats. Prize, a medal 

 The memoirs may be written in Dutch, French, or German ; 

 but only in Italic characters. They muft be accompanied 

 with a fealed billet, containing the name and addrefs of the 

 writer, and fent to M. Van Marum, Secretary of the Society. 



The Batavian Society has propofed as one of the prized fub- Fermentation, 

 jects to be decided on the 1 ft of May 1 802, the following quef- 

 tion : " What do we learn from the lateft difcoveries in che- 

 miftry refpedting the nature of fermentation, and what advan- 

 tages may refult with regard to certain trades in which fermen- 

 tative matters are ufed?" It was not thought fit to adjudge the 

 prize ; but without opening a new concurrence, the Society has 

 engaged the author of a memoir, of which the device is, Tout 

 eft important dans les vo'ies de la nature, to fupport his theory 

 upon more decifive experiments, and to extend its application 

 to a greater number of manufactories ; with promife of the 

 crown if he fhall accomplifh his purpofe before the end of 1803 

 or 1804. 



Sixth Defcent of Garnerin with his Parachute. 



On the 21ft of September 1802, at feventeen minutes paft Account of Gar- 

 r • r m r nerin's defcent 



five in the evening, the aeronaut Garnerin fent off from the by a parachute. 



Parade in North Audley Street, an exploring balloon, which 

 took a north-eaft direction until it attained a very confiderable 

 elevation, and foon difappeared. At fifty-eight minutes after 

 five the great balloon itfelf afcended with the parachute de- 

 pending, and beneath it the cylindrical bafket in which Gar- 

 nerin himfelf flood and repeatedly waved his flag. Its flow 



afcent 



