FPossit Enerinite. ae 359 
the southern magnetism. repulsed. itt ‘adhe this movement of 
the northern and southern magnetism for the commencement of 
revolutions in opposite directions of the two figures, they can be 
put in the helix in a corresponding manner, the situation of the 
figures which result from it will account then for the direction = 
the electric current. 
If a southern. pole, for dnnighe, is turned to the left aati 
its axis, let us fancy the symbol of the southern magnetism in-- 
troduced into the interior of the “magnet in a situation corres- 
ponding to the direction of rotation: the electric current resulting 
from this, will be directed then from the head of the figure 
spoken of towards. the feet. - ‘It is evident that the wire com- 
municating to the southern pole, receives the northern magnet- 
ism at the place of contact, whether this contact is effected imme- 
diately or by the agency of the mercury. It will be seen that 
this wire will turn respectively to the right. if the southern pole 
turns to the left, conformably to our symbol... And in effect, és 
the essential point in this trial, and departing hence, we can 
easily obtain a long series of ‘varied and instructive experiments. 
It is necessary to warn all those who intend to repeat them, 
to take all precautions to avoid thermo-electric currents, the mul- 
tiplier described above being very subject to them. In effect, 
it can be easily - demonstrated in experimenting in the man- 
ner indicated above, that the thermo-electric current is greater 
than an hydro-electric current produced by a single pair of zinc 
and copper disks, which are about equal in size to a crown, (or 
half dollar,) and are wetted with a solution of muriate of soda. 
“Arr. XVII Fist Enerin inite ; by Joun G. ANTHONY. 
: “Cincinnati a ith, 1838. 
TO PROF, SILLIMAN. 
Dear Sir—Encuiosev I send you'a drawing of a speci- 
men in my collection, which I found near this place in March 
The first specimen of this fossil was discovered by myself 
a year since, and consisted merely of the reticulated part, with- 
out any stem, and but a ‘small portion of the: fimbriz. During 
the past winter more than seventy similar specimens were washed 
‘out by the rains from the rubbish of a quarry, and picked up,— 
« 
