Gas Illumination, 395 



•^^evenieen colonies on the western coast. The interior is 

 not habitable owing to accumulations of ice. The popu- 

 lation has increased seven hundred and fovu-teen since the 

 year 1789. — Ibid 



47. Mildeio. 



Dr. Cartwright has ascertained that a solution of com- 

 mon salt, sprinkled on wheat infected with mildew, com- 

 pletely removes the disease. Six or eight bushels of salt 

 will serve an acre, the expence will be more than repaid 

 from the improvement of the manure, arising from the salt- 

 ed straw. The efficacy of this remedy has been complete- 

 ly verified. Its operation is so quick, that in forty eight: 

 hours, the vestiges of the disease are hardly discernible. 



Ibid. 



48. Theory of Electricity. 



A paper was read by Dr. Van Marum, at the Royal In- 

 stitution of the Sciences at Amsterdam in 1819, the reason- 

 ing of which goes far to prove that the Franklinian hypoth- 

 esis of a single electrical fluid is the true one; and that the 

 theory of Du Fay, of vitreous and resinous fluids principally 

 supported by the French philosophers, does not so well ex- 

 plain the phenomena. The paper of Van Marum is pub- 

 lished in Thomson's Annals, December 1820. 



49. Gas illumination^ 



Has been introduced into one of the districts of Paris 

 with the best effects, under the judicious direction of M.. 

 Darcet. The hospital of St. Louis which contains seven 

 hundred patients is finely lighted by it, as also the hospital 

 for incurables in Rue des Recollets, and the Maison de San- 

 ti. Rue St. Denis and the prison de St. Lazare. Three 

 hundred lights are sufficient for the hospital St. Louis. 

 The gas is obtained by the distillation ofroah 



VoT,. in., ..No. 2. 49 



