250 
PROFESSOR TYNDALL’S FURTHER RESEARCHES 
Current direct. 
Current reversed. 
Position 1. 
Series I. 
620 
Series II. 
670 
224 
Position 2. 
618 
668 
226 
Position 3. 
616 
666 
228 
The change of the bars from position 1 to 3 is in this case accompanied by perma- 
nent deflection corresponding to four divisions of the scale. The deflection indicates 
the polarity of diamagnetic bodies. The magnet was remarkably steady during 
these experiments, and the consequent clearness and sharpness of the result pleasant 
to observe. 
XIII. 
Cylinders of Sulphur, 
length 6 inches, 
diameter 0'7. 
Current direct. 
Position 1. 658 5 
Position 2. 657 
Position 3. 655”5 
Current reversed. 
222 
223-5 
225-5 
XIV. 
Cylinders of Nitre. 
length 3-5 inches, 
diameter 0 - 7 . 
Current direct; Current reversed. 
Position 1. 648-5 263 
Position 3. 647 265 
Finally, as regards solid diamagnetics, a series of experiments was made with 
wax ; this also being one of the substances whose negative deportment is urged by 
M. V. Feilitzsch against M. Weber. 
XV. 
Cylinders of Wax. 
length 4 inches, 
diameter 0 - 7 . 
Current direct. Current reversed. 
Position 1. 624-5 240 
Position 3. 623 241 
The action is very small, but it is nevertheless perfectly certain. The argument 
founded on the negative deportment of this substance must therefore give way. 
