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was liberated in all the trials, but in no case was helium detected, even by the use of the highly sensitive spectroscopic method of Soddy, which will detect 2 X 10~10 g. of helium. It is found that ordinary spectroscopic methods for the detection of helium are, on the other hand, not at all sensitive. In no case was the amount of heat produced noticeably greater than that to be expected from the condenser discharge alone. However, no actual-measurements were made of the heat liberated, since it was found that the spectroscopic method of Soddy is fully as sensitive as the calorimetric method, and is more definite in its significance.4. The theory of atomic disintegration is discussed, and it is pointed out that the failure of the electrical discharge methods to disintegrate the atom is due to the fact that energy is not transmitted to the nucleus in a sufficiently high concentration. Electrons with velocities of several million volts may prove effective, though thus far only high-speed aparticles have induced disintegration, as in the experiments of Rutherford.5. The condenser, using the 84,000-volt arrangement, was discharged 100 times through a 500cc. bulb containing very pure hydrogen at 40mm. pressure. This was repeated three times. Tests by the method of Soddy revealed no trace of helium.Chicago, Illinois

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