History of Astronomy for the Year 1805. 351 
I did all I could to dissuade him from it: my efforts have 
been in vain ; and I only mention this to prevent the public 
from being deetivedl: 
The dhe servations of the tides have been continued in se- 
veral harbours: at St. Maloes, by’ M. le Cerf; at Ostend, 
by M. Porquet ; at Sables d’Olonne, by M. Depoge. 
The tide at Brest, at the spring equinox, having taken 
place with an east wind, I requested some observations of it, 
and J found that it had not surpassed the mean tide ; which 
completely confirms the system I have laid down in my 
treatise upon the flux and reflux of the sea.—that when the 
equinoxial tides are highest, it is occasioned by the wind. 
, Geography has been enriched by various important 
voyages. ‘That of Hearn has been published, made be- 
tween 1769 and 1772, to the north-west of Hudson’s bay. 
Jt extended from Churchill’s river, which flows into the 
bay, to the 72° of latitude, an extent of 100 myriametres, 
in the country of the Esquimaux who inhabit the neigh- 
bourhood of the Coppet river. The maps of North Ame- 
rica will be much altered by this voyage. The communica- 
tion from sea to sea, so often spoken of seems to be more 
and more illusory. 
Captain Krusenstern, the commander of two Russian 
vessels, with which he sailed round the world, arrived at 
Kamschatka on the 8th of August, 1804; after having dou- 
bled Cape Horn and landed upon the Marquesas and Sand- 
wich islands, he proposes visiting China and Japan. The 
account of this voyage will be very interesting, and will 
do honour to the Petersburgh Academy, who obtained 
permission from the emperor of Russia for it to be under- 
taken. 
In the 28th number of the Annals of the National Mu- 
seum of Natural History, February 1805, we find that cap- 
tain Lewis is gone to feconnoitre the Missouri as far as its 
-source. He will afterwards search for the nearest river to 
the westward, and will descend by it to the Pacific Ocean. 
This expedition, composed of twelve persons, will probably 
return in a few months. The president, Mr, Jefferson, -in- 
‘ tends 
