Prof. E. Wartmann's Fifth Memoir on Induction. 89 



I did not think it necessary to determine the carbon and 

 hydrogen in this compound, as the sulphur calculated as sul- 

 phurous acid, and the nitrogen as the oxide of ammonium, 

 immediately determine the nature of the substance formed, and 

 the near approach of the quantities of these elements found 

 by experiment to the numbers required by theory, leave no 

 doubt as to the correctness of the above formula. 



I was in the act of making further investigations on this 

 subject, and had prepared compounds of a most interesting 

 nature, by the action of sulphuretted hydrogen and sulphuret 

 of carbon on cenanthylammon, when the town in which I was 

 residing became the prey of one of those political convulsions 

 which mark the present aera. The laboratory in which I 

 worked was stormed, being in an exposed position, and every- 

 thing it contained destroyed amidst the uproar. Instruments 

 and the substances under investigation were alike scattered in 

 fragments around, — only with difficulty I myself escaped. 

 Such must be my excuse for the imperfectness of the present' 

 paper, but as soon as possible I purpose continuing this in- 

 vestigation. 



XV. Fifth Memoir on Induction. By M. Elie Wartmann, 

 Professor of Natural Philosophy in the Academy of Geneva*. 



[With a Plate.] 



[Continued from vol. xxxi. p. 251.] 



§ XVII. On the non-propagation by radiatio?i of Dynamic 

 Electricity. 



146. T> ADIATION and conductibility are the only two 

 -EV modes known by which imponderable fluids are 

 propagated. The first, possessed in common by heat and 

 light, has furnished theorists with more than one occasion of 

 discussing the relative value of the systems of emission and 

 undulation. Conductibility is a second form of propagation 

 peculiar to heat, and which light does not present. What 

 is the true character of transmission of electricity ? This is 

 an important question, the solution of which requires direct 

 experiments. 



147. Analogy furnishes no data which can inspire any con- 

 fidence. It is generally agreed that the imponderable agents 

 form two distinct groups. Light and radiant caloric are 



• Communicated by the Author, having been read before the Societe 

 de Physique et d'Histoire Naturelle of Geneva, March 2, 1848. 



