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Whenever any one meets with aterrella , or spherical loadstone, the first thing he does is to find out its poles; and having once discovered them, he knows immediately how any small bit of needle will be affected, if it is placed upon any part of the surface of thatterrella . The poles are most readily discovered by trying where the filings of iron, or a small bit of needle, will stand erect upon theterrella ; and this is generally found to be upon two points which are diametrically opposite to one another. But the magnetic poles of the earth seem to be situated obliquely to one another (see the Berlin Memoirs, 1757); but where they are actually situated is hitherto unknown; whether they are upon land or water; or in either case, whether we can come nigh to them. Yet be there things as they may, it appears evident to me, that accurate observations, made as near to these magnetic poles as possible, with a good dipping-needle, are the surest way to complete the magnetic theory of this globe, analogous to the method we pursue in examining theterrella .

VII. Description of a new Dipping-needle. By Mr. J. Lorimer, of Pensacola, in a letter to Sir John Pringle, Bart. P.R.S