ACTION OF MAGNETS ON METALS AND THEIR COMPOUNDS. 
49 
2388. Uranium . — Peroxide of this metal was obtained not magnetic; protoxide very 
slightly magnetic : I have set the metal for the present in the diamagnetic class. 
2389. Tungsten . — The oxide of this metal, and also the acid, were submitted to 
examination, and found to point well equatorially. The acid was distinctly repelled 
by a single magnetic pole ; the oxide appeared nearly neutral. Hence I have, for 
the present, considered tungsten as a diamagnetic metal. 
2390. Silver • is not magnetic (2291.), nor its compounds. 
2391. Antimony is not magnetic (2291.), nor its compounds. 
2392. Bismuth is not magnetic (2291.), nor its compounds. 
Having tried many of the compounds of each of these three metals, I thought it 
well to record the accordance existing between them and their metallic bases (2370.). 
2393. Sodium . — A fine large globule, equal to half a cubic inch in size, was well 
repelled, and is therefore diamagnetic. 
2394. Magnesium- 
-None of the compounds or salts of this base are magnetic. 
2395. 
Calcium. 
Strontium. 
Barium. 
Sodium. 
Potassium. 
Ammonia. 
None of the compounds or salts of these substances are magnetic. 
2396. From the characters, therefore, of the compounds, as well as from direct 
evidence in respect of some of the metals, it would appear that, besides iron, nickel, 
and cobalt, the following are also magnetic ; namely, titanium, manganese, cerium, 
chromium, palladium, platinum. It is, however, very probable that there may be 
metals possessing distinct magnetic power, yet in so slight a degree as, like platinum 
and palladium, not to exhibit in their compounds any sensible trace of it. Such 
may be the case with tungsten, uranium, rhodium, &c. 
2397. I have heated several of the diamagnetic metals, even up to their fusing- 
points, but have not been able to observe any change, either in the character or 
degree of their magnetic relations. 
2398. Perhaps the cooling of some of the metals, whose compounds, like those of 
iron, nickel and cobalt, are magnetic, might develope in them a much higher degree 
of force than any which they have as yet been known to possess. Manganese, chro- 
mium, cerium, titanium, are metals of much interest in this point of view. Osmium, 
iridium, rhodium and uranium, ought to be subjected with them to the same trial. 
2399. The following is an attempt to arrange some of the metals in order, as 
respects their relation to magnetic force. The 0° or medium point is supposed to be 
the condition of a metal or substance indifferent to the magnetic force as respects 
attraction or repulsion in air or space. The further substances are placed from this 
point, the more distinctive are they as regards their attraction or repulsion by the 
magnet. Nevertheless this order may, very probably, be found inaccurate by more 
careful observation. 
MDCCCXLVI. 
H 
