REFERENCES

J. Cox, Beyond the Atom, 1913 (Cambridge Manuals of Science and Literature).

R. K. Duncan, The New Knowledge, 1905.

H. Poincaré, Science and Hypothesis.

E. Rutherford, Radioactive Substances and their Radiations.

F. Soddy, The Interpretation of Radium.

F. Soddy, Matter and Energy (Home University Library).

Sir William A. Tilden, Progress of Scientific Chemistry in our Own Time, 1913.