M. Gambey, in 1829, by the city of Geneva. | ‘They werea 
theroute ‘from Paris, and arrived in perfect order. © pte a 
well adjusted, with the assistance of the maker, in the observatory > 
the transit instrument, in the principal ball of the ground floor, and 
the equatorial in the eastern tower under a hemispherical cupola with 
. moveable roof. They are the admiration of all who have seen them, 
from the the beauty of their execution, their free and easy — 
a * hele pas nuns Oniv. Mai, 1832. 
<8isMedal for discovery of GometsintTie king of ahi to 
whom astronomy is under numerous obligations, offers a gold medal, 
of the weight of twenty ducats, to any one who shall have found the 
first comet whose revolution is not yet known, and which is not visible 
tothe naked eye. ‘The discoverer must’ give immediate informa- 
tion to the counsellor of state, Schumacher. The medal will be de- 
creed six months after the discovery, to give time for paypemrnee: a 
eeeeieee of 0 ehniniseiden. eg 
ee 
ssor of the 
A, Maximum density of Water.—M. Sent : 
ic Institute of Vienna, has recently published a 
tailed memoir on the absolute weight of water at different tempera- 
tures. "His results do not entirely agree with those of prior enquir~ 
ers: He places the maximum density at the temperature of 3°.75— 
- Centigrade = 389.75 Fahrenheit.—Annalen der vie pee Janes XXI. 
- 76: ee WF 
init 
San, 
=e On the iniieindnsi motions fie se pitndaliie and the surround= 
observed in the open air. It-had in fact been supposed till then, 
that the loss of weight which a pendulum sustains, when plunged in 
a fluid, is the same, whether the body is at rest or in motion. Ex- 
perience proves the contrary, and the theory of the motion of fluids” 
has also led M. Poisson’ to demonstrate that the Festlt onghteasiae 
