Sciendjtc Intelligence. — Mechanical Philosophy. 173 



2. Iron Works of Sioeden. — The account of exportation of iion 



from Sweden during the year 1828, in tons of 1000 kilo-grammes 

 each, (2200 lbs.) was as follows : — 



United States, - - - 9.409 tons. 



Germany, _ _ _ _ 6.676 



Great Britain, _ . - 5.753 



France, . - . - 5.096 



Portugal, - - - - 3.200 



Denmark, _ _ - - 1.771 



Low Countries, - - - 1.436 



Indies, _ _ _ _ 893 



Russia, - - - - 350 



Brazil, - - - - 289 



Malta, ... - 142 



Spain, - - - - 64 



Antilles, - - - - 58 



Italy, 40 



Norway, - * - - 35 



Total, 35.212 tons. 



The value of which, in the Swedish ports, is from ten to eleven mil- 

 lions of francs, (two to 2 1-5 millions of dollars.) 



This is about one fifth of the total production of France. In 

 Sweden, the only fuel with which the forges are supplied is wood ; of 

 course the fabrication is limited to the annual production of this com- 

 bustible, and cannot be increased as in forges supplied with pit coal. 

 Hence, if the demand for Swedish iron should rise much above what 

 it is at present, it is probable that the price would augment rather 

 than the production increase. We have not much satisfactory infor- 

 mation on the metallurgic resources of Sweden, and it appears that 

 in relation both to art and economy, we have much yet to learn from 

 them. This knowledge would come very seasonably at a time when 

 our forges are calling for important ameliorations, and capital is wait- 

 ing only to be secure in its results. — Rev. Encyc. Mai, 1829. 



3. Calorific effects of the Voltaic pile. — Prof. De La Rive, in a 

 memoir read to Soc. de Phys. et d' Hist. Nat. of Geneva, on the 

 4th of Sept. 1828, considers these effects as owing to the difficulty 

 which the electric current finds iu passing from one body to another, 

 or from one molecule to the following, and to the resistance which it 

 meets in these successive transits. 



