20 DR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XXII.) 
of the crystal to that which it had before. If now the magnet were reinvigorated 
by the electric current, the crystal instantly spun round and took a magnetic state 
in the first or original direction. The crystals could in fact become magnetized in 
any direction, but there was one direction in which they could be magnetized with a 
facility and force greater than in any other. From the appearances I am inclined to 
refer this to the crystalline condition, but it may be due to an irregular diffusion of 
iron in the masses of titanium. The crystals were too small for me to make out the 
point clearly. 
2537 . Copper. — I selected some good crystals of native copper, and, having care- 
fully separated them from the mass, examined them in respect of their magnecrystallic 
force. At the horse-shoe magnet (2486.) they gave no signs of such power, what- 
ever the direction in which they were suspended, but stood in any position ; and any 
degree of torsion, however small, applied at the upper extremity of the suspending 
filament was obeyed at once, and to the full extent, by the crystal beneath. When 
subjected to the electro-magnet, the phenomena of arrest and revulsion were produced 
(2513. 2310.), as was to be expected. Tf after the arrest the magnetic force were 
continued, there was no slow advance of the crystal up to a distinct pointing position 
(2512.) ; it stood perfectly still in any position. So there is no evidence of magne- 
crystallic action in this case. 
2538. Tin. — 1 selected from block and grain tin some pieces which appeared, by 
their external forms and the surface produced under the action of acids, to have a 
regular crystalline structure internally ; and, cutting off portions, carefully submitted 
them to the power of the magnets, but there was no appearance of any magnecrystallic 
phenomena. Indications of the arresting and revulsive actions were presented, and 
also of diamagnetic force, but nothing else. I also examined some crystals of tin 
obtained by electro-chemical deposition. They were pure and diamagnetic : they 
were arrested and revulsed, but they showed no signs of magnecrystallic action. 
2539. Lead. — Lead was crystallized by fusion, partial solidification, and pouring 
off (2457.), and some very fair crystals, having the general form of octohedra, 
obtained. Observed at the magnets, these were arrested and revulsed feebly, but 
presented no magnecrystallic phenomena. Some fine crystalline plates of lead ob- 
tained electro-chemically from the decomposition of the acetate by zinc, were sub- 
mitted to the magnet : they were pure, diamagnetic, and were arrested and revulsed, 
but presented no appearance of magnecrystallic action. 
2540. Gold. — Three fine large crystals of gold were examined. They were 
diamagnetic, and easily arrested (2310. 2340.) ; the revulsion did not take place, 
because of their octohedral or orbicular form. They presented no magnecrystallic 
indications. 
2541. Tellurium. — Two fractured pieces of this substance, presenting large and 
parallel planes of cleavage, were examined : both pointed, and the greatest length 
was across the axial line between flat-faced poles (2463.). I think the effects w^ere 
