Mr. Seybert’s Analysts of Glassy Actynolite. 331 
attract fine iron filings, so long as the apparatus remains in 
the dilute acid, but instantly loses that power when with- 
drawn from the liquid. One curious result is presented by 
this apparatus, which we should not have anticipated from 
experiments made by myself with common electricity, and 
which I sent to you when I last wrote, nor from the experi- 
ments of Mr. Bowen, with Hare’s calorimotor; it is this: 
when the spiral brass wire passes from right to left, the 
north pole is found on the negative or copper end; if from 
left to right, that pole is found on the positive or zinc end; 
this effect is like that noticed by Van Beck. _ It certainly in- 
dicates another point of difference, which Dr. Hare justly 
asserts to exist between common galvanic instruments and 
his calorimotor; and the result of Mr. Bowen’s experiments, 
and my own with common electricity, points out an analogy 
between the effects of the common electrical machine and 
ofthe calorimotor. I have triedin vain tocommunicate such 
a degree of magnetism to silver and platina wires by this 
little apparatus as to induce them to assume a north and 
south direction; and I have in vain attempted to influence 
delicately suspended galvanic apparatus by the rays of 
light separated by a prism; but I doubt not that some for- 
tunate philosopher, in possession of a heliostadt, will be able 
to produce some effect in this way. 
Dartmouth College, Hanover, N. H. 
Arr. XVI.—Analysis of the Glassy Actynolite from Concord 
Township, Delaware Co. Penn. By. H. Sevpert. 
Coror in the mass, emerald green; powder greenish white. 
Lustre vitreous. Translucent. Fracture in one direction 
fibrous, in the opposite irregular. Very frangible. Scratch- 
es glass. Structure fibrous and fasciculated. Specific gravi- 
ty 2.987. Fusible, before the blowpipe, into an opake 
greenish enamel. 
Analysis. 
A. 3 grammes of the mineral, in the state of an impal- 
pable powder, after exposure to a red heat, with the contact 
of air, had assumed a reddish tinge, and weighed 2.98 
