92 On the Diurnal Magnetic Declination. [Aug* 



Sulphur and Phosphorus undergo ivhen burnt. Mem. Par. 1783. 

 Published in I7S6. 



56'. Remarks on Phlogiston. An Exposition of the Theory of 

 Combustion and Calcination made known in 1777- Mem. Par. 

 1783. Published in IJS6. This isn full exposition of his own 

 theory, and a refutation of the Stahlian theory. By this time 

 Lavoisier had been joined by Berthollet and*Fourcroy, and had 

 formed the design of propagating his opinions. 



57. Experiments on the Effect of a Fire supported by Oxygen 

 Gas on the Weight and Fusion of Mineral Bodies. This is a 

 continuation of a subject already begun in a preceding paper. 



58. Memoir on the Manufacture of Saltpetre. Ann. de Chim. 

 xv. 225. It is generally believed that Lavoisier was mistaken in 

 his opinion respecting the great quantity of saltpetre volatilized 

 during the boiling of the ley. 



59. Result of some Experiments on Agriculture^ and Reflec- 

 tions on their Connection with Political Economy. Ann. de 

 Chim. xv. 29J. 



These are all the papers of Lavoisier with which I am ac- 

 quainted. It is probable, considering the dreadful period during 

 which he terminated his career, that he may have published 

 others with which I am unacquainted. His Essay on the Chemi- 

 cal Nomenclature, and his Elements of Chemistry, are too well 

 known to require being particularized. I do not notice the 

 posthumous volume of his essays published about six years ago 

 in Paris by his widow, because 1 have never had an opportunity 

 of seeing the book. It is chiefly historical, and will be more 

 curious by determining the objects which Lavoisier aimed at, 

 than the dates of his speculations, which are sufficiently deter-r 

 mined from his original publications. 



Article II. 



Experiments on the absolute Magnetic Declination, and on the 

 Amount of the Horary Variations of Needles in the same 

 Place and Time, according as the Magnetic Fluid is differently 

 distributed in their Interior. By Dr. Schiibler; of Stuttgardt.* 



The following experiments were made with simple needles, 

 three or four feet in length, suspended by a fine silk thread, in 



> Translated from the Journal de Physique for September, 1812, vol. lxxv. 

 p. 173. I have been induced to translate this paper by the singularity of the 

 results which it exhibits. Though far from convinced of their accuracy, I 

 think they are entitled to a careful repetition, in order to ascertain whether 

 the state of the needle itself has any effect upon the daily variation. 



