French Rock Salt.— Nautical Ephemeris. 



149 



quantity of iron ore found on it, and especially Moinit Calamita, 

 (supposed to be a solid mass of loadstone,) has a sensible effect 

 on the mariner's compass, is unfounded. Mr. Charles Rumken 

 in ISIS could not find, at the distance of two or three or four 

 nautical miles, the declination of his needle affected in the least 

 by the action of the island. 



FRENCH ROCK SALT. 



In July last a regular search for rock-salt was commenced at 

 Moyenire in the department of La Meurthe. At the depth of 

 200 feet they found a bed 1 1 feet thick ; below this the work- 

 men perforated a bed of gypsum and clay of 546 feet, when they 

 reached another bed of salt eight feet thick. The salt of the 

 first bed is very white and transparent, and very pure : the se- 

 cond contains a small portion of gvpsuin and argillaceous sub- 

 stances, and is brownish like clouded flint. It contains hardly 

 any nuniate of magnesia or sulphate of lime. Both present a 

 cubical fracture. 



COMPARATIVE STRENGTH OF EUROPEANS AND SAVAGES. 

 [From Bulletin No. 156 of the Society of Encouragement in France.^ 

 M. Peron, the naturalist, has had occasion to observe, that 

 men in a savage state are inferior in strength to men civilized ; 

 and he has demonstrated in a very evident manner, that the im- 

 provement of social order does not, as some have pretended, de- 

 stroy our physical powers. The following is the result of expe- 

 riments which he has made on this subject with the Dynamo- 

 meter of M. Regnier (described Phil. Mag. Vol. I.) 



Comparative Experiments on the Strength of Europeans and 

 Savages. 



NAUTICAL EPHEMERIS. 



To Mr. Til loch. 

 It is but a short time since I submitted to you a few remarks 

 on the contracted su])ply of the Nautical yMmanac, which you ho- 

 noured with a place in No. 25J) of your valuable Journal. My 

 anxioas feeling (or the safety of P)ritish maritime commerce again 

 K 3 prompts 



