Overland Expedition. — Soundings. — L'ighi- Houses. 389 



voyagers, to the southward. If so, it must be a magnetic phse- 

 iiomenon. 



It is the opinion of one of our first hydrographers, that possi- 

 bly the opening to the south of Lancaster Sound, to which the 

 name of " Prince Regent's Inlet" has been given, extends to 

 Repulse Bay, or to Hudson's Bay. 



THE OVERLAND NORTHERN EXPEDITION. 

 The last accounts from Lieutenant Franklin state his arrival 

 at Great-Bear Lake (W. long. 120", lat. N. about 67') where he 

 means to hut for the winter. He could have reached Copper- 

 mine River, but not in time to obtain the desired information this 

 season; and he therefore resolved to winter at Great-Bear Lake, 

 and to start with the return of proper weather, so as to have the 

 whole summer before him for the object of the expedition. 



SOUNDINGS AT SEA. 



In answer to a query by J. K. K. on this subject, I beg to in- 

 form him, that a method very similar to that suggested in his 

 letter is in use, — a graduated glass tube of some length, full of 

 air, excepting a known portion, in a curve at the bottom, of any 

 viscous coloured liquid, which being forced up the tube by the 

 pressure of the sea water, indicates, by the mark which it leaves 

 inside the tube, the degree to which the contained air had been 

 compressed, and consequently (if the specific gravity of the sea 

 water be ascertained) the depth to which the instrument had de- 

 scended. This instrument needs no piston. T. 



VOYAGE OF DISCOVERY. 



The French corvette L'Uranie, commanded by M. de Frevci- 

 net, sailed from New South Wales to pursue her voyage of dis- 

 covery on the 25th of December last. On getting under weigh 

 she was saluted by the fort, which was returned by the battery 

 from Dawes' Point. 



LIGHT-HOUSES. 



A new light-house is erecting at the Tower Dei Baldnes, Isle 

 of Rh^. The light will make one revolution in six minutes. In 

 the interval will be foin- appearances of a white, very brilliant 

 light. At each interval of 1)0 seconds a very sparkling lustre will 

 he seen for about 15 seconds, and will gradually diminish till it 

 disappear. 



The Bey of Tunis has erected a light, maintained by oil, in the 

 anchorage of the Golctta. It is elevated on the top of a mast of 

 the height of 40 feet. It will be of great service in guarding 

 against an error that has often proved fatal, the mistaking the 

 Gulph of Porto Farino for that of the Golctta. 



The 



