40 DR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XXII.) 
the magneto-crystallic state ; but this state does not appear to be due to polarity, 
and the bar does not convey more power through it than is conveyed onwards else- 
where through an equal space in the magnetic field. Hence its directive force does 
not increase in the same rapid degree as the directive force of the magnetic bar just 
referred to. 
2630. If then we take a bar which, like a prism of sulphate of iron, is magnetic, 
and also magnecrystallic, having the magnecrystallic axis perpendicular to its length, 
such a bar, properly suspended, ought to have an n distance of the poles, within 
which the forces ought to be nearly in equilibrium ; whilst at a greater distance of 
the poles, the magnecrystallic force ought to predominate ; and at a lesser distance, 
the magnetic force ought to have the advantage ; simply, because the magnetic 
force, in consequence of the true polarity of the molecules, grows up more rapidly 
and diminishes more rapidly than the magneto-crystallic force. 
2631. This view, also, is consistent with the fact that variation of the force of the 
magnet does not affect the n distanee (2618. 2619.); for, whether the force be 
doubled or quadrupled, both the magnetic and magneto-crystallic forces are at the 
same time doubled or quadrupled ; and their proportion therefore remains the same. 
2632. The raising or lowering of the crystal above or below the line of maximum 
magnetic force is manifestly equivalent in principle to the separation of the magnetic 
poles ; and therefore should produce corresponding effects : and that is the case 
(2617.)- Besides that, when the crystal is raised above the level of the poles, such 
resultants of magnetic force as pass through it, are no longer parallel to its length, 
but more or less curved, so that they probably cannot act with the same amount of 
power in throwing the whole crystal into a consistent polarized magnetic condition, as 
if they were parallel to it : whereas, as respects the induction of the magneto-crystallic 
condition, each of the particles appears to be affected independently of the others ; and, 
therefore, any loss of an effect dependent upon joint action would not be felt here. 
2633. M. Plucker told me, when in England in August last, that the repulsive 
force on the optic axis diminishes and increases less rapidly than the magnetic force, 
by change of distance; but is not altered in its proportion to the magnetic force by 
employing a stronger or weaker magnet. This is manifestly the same effeet as that 
I have been describing ; and makes me still more thoroughly persuaded that his 
results and mine are due to one and the same cause (2605. 2607.)* 
2634. I have said that, within the n distance, the crystal of sulphate of iron pointed 
more or less obliquely (2616.) ; I will now state more particularly what the circum- 
stances are. If the distance n be so adjusted, that the prismatic crystal, which is at 
the time between the magnetic poles, shall make an angle of 30° (or any quantity) 
with the axial line ; then it will be found that there is another stable position, 
namely, the diametral position (2461.), in whieh it can stand ; but that the obliquity 
