250 W. Crookes—Radiant Matter. 
the side pole (a’) the negative, the top pole (0) being positive. 
Notice how widely different is the appearance from that shown 
by the last bulb. The negative pole is in the form of a shal- 
low cup. The molecular rays from the cup cross in the center 
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5 
a 
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from the top, and connect it with the side pole (c). 
patch from the divergent negative focus is there still. 
make the lowest pole (d) positive, and the green patch remains 
i> it was at first, unchanged in position or intensity. 
