Miscellaneous Notices by Prof. J. F. Dana. 163 
however, were observed in the woods, and in small yards 
and other inclosures, sheltered from the wind, thus indica- 
ting that their formation commenced in the atmosphere. 
Similar balls were observed in most of the contiguous towns. 
Their appearance on the river Androscoggin was extreme- 
ly interesting, 
Art. XII.—Miscellaneous Notices by Prof. J. F. Dana, of 
: Dartmouth College. 
1. Connexion of Electricity, Heat, and Magnetism. 
The notices which have appeared in your Journal on the 
connexion between Electricity and Magnetism have indu- 
ced me to make some experiments, and as they tend to con- 
firm those made by Mr. Bowen, I will mention them. The 
apparatus consisted of the Leyden bottle and glass tubes sur- 
rounded by brass wire. I have not yet had opportunity to 
repeat any of the experiments with the galvanic battery, ex- 
cept in one instance when a piece of steel was inclosed ina 
glass tube half an inch in diameter and surrounded by a spi- 
ral coil of brass wire, and the influence from my battery, 
consisting of two hundred plates six inches square, was pas- 
sed through the coil for one minute, the steel] did not appear 
next the negative, whether the jar was charged with posi- 
tive or negative electricity. These two experiments con- 
firm those of Mr. Bowen. In using a tube surrounded bya 
coil passing from right to left for one half its length, and then 
in the contrary direction, as in Mr. B’s. experiment, I found, 
when the jar was charged with positive electricity, and the 
coil began to pass from right to left on the positive, that both 
