ACTION OF MAGNETS ON DIAMAGNETIC BODIES GENERALLY. 
27 
piece of thick India rubber, neither being magnetic after the ordinary fashion, were 
well directed and repelled. 
22/8. Crystalline bodies were equally obedient, whether taken from the single or 
double refracting class (22370- Prisms of quartz, calcareous spar, nitre and sulphate 
of soda, all pointed well, and were repelled. 
22/9. I then proceeded to subject a great number of bodies, taken from every class, 
to the magnetic forces, and will, to illustrate the variety in the nature of the sub- 
stances, give a comparatively short list of crystalline, amorphous, liquid and organic- 
bodies below. When the bodies were fluids, I inclosed them in thin glass tubes. 
Flint-glass points equatorially, but if the tube be of very thin glass, this effect is 
found to be- small when the tube is experimented with alone ; afterwards, when it is 
filled with liquid and examined, the effect is such that there is no fear of mistaking 
that due to the glass for that of the fluid. The 
tubes must not be closed with cork, sealing-wax, or J ‘ 
any ordinary substance taken at random, for these ( 
are generally magnetic (2285.). I have usually so V_ 
shaped them in the making, and drawn them off at 
the neck, as to leave the aperture on one side, so that when filled with liquid they re- 
quired no closing. 
2280. Rock crystal. 
Sulphate of lime. 
Sulphate of baryta. 
Sulphate of soda. 
Sulphate of potassa. 
Sulphate of magnesia. 
Alum. 
Muriate of ammonia. 
Chloride of lead. 
Chloride of sodium. 
Nitrate of potassa. 
Nitrate of lead. 
Carbonate of soda. 
Iceland spar. 
Acetate of lead. 
I artrate of potash and antimony. 
Tartrate of potash and soda. 
Tartaric acid. 
Citric acid. 
Water. 
Alcohol. 
Ether. 
Nitric acid. 
Sulphuric acid. 
Muriatic acid. 
Solutions of various alkaline and 
earthy salts. 
Glass. 
Litharge. 
White arsenic. 
Iodine. 
Phosphorus. 
Sulphur. 
Resin. 
Spermaceti. 
Caffeine. 
Cinchonia. 
Margaric acid. 
Wax from shell-lac. 
Sealing-wax. 
Olive-oil. 
Oil of turpentine. 
Jet. 
Caoutchouc. 
E 2 
