464 Joseph Henry. 
of the questions of priority connected with them, will be the 
duty of the academician to whom shall be assigned the prepara- 
tion of a memoir or eulogy of the distinguished author. 
Without assigning dates we give the following brief enume- 
ration of his memoirs and discoveries, taken from a communi- 
Witt, the organization of the meteorological system of the 
State of New York. 
. The development, for the first time, of magnetic power, 
sufficient to sustain tons in weight, in soft iron, by a compara- 
tively feeble galvanic current. 
-he first application of electro-magnetism as a power, to 
produce continued motion in a machine. 
. An exposition of the method by which electro-magnetism 
might be employed in transmitting power to a distance, and the 
demonstration of the practicability of an electro-magnetic tele- 
graph, which, without these discoveries, was impossible. 
6. The discovery of the induction of an electrical current in 
a long wire upon itself, or the means of increasing the intensity 
of a current by the use of a spiral conductor. 
. The method of inducing a current of quantity from one 
of intensity, and vice versa. 
8. The discovery of currents of induction of different orders, 
and of the neutralization of the induction by the interposition 
of plates of metal. 
; substances. 
12. Investigations on molecular attraction, as exhibited in 
liquids, and in yielding and i 
_the theory of soap bak bak 
= called upon to investigate the causes of the bursting of the 
great gun on the United States Steamer Princeton.] 
