Today's installment concludes Early Science of Radioactivity,the name of our combined selection from Mme. Marie Curie, Sir William Ramsay, and Sir

It was Robert Boyle, in his " Skeptical Chymist," who first controverted these ancient and medieval notions, and who gave to the word "element" the

The emission over, and the fragment of the atom gone, the residue is no longer radium, but is something else.Continuing Early Science of

Atoms of matter are not simple, but complex; each is composed of an aggregate of smaller bodies in a state of rapid interlocked motion, restrained and

Many forms of matter can evaporate, and many others emit scent; wherein, then, lies the peculiarity of radioactive substances, if the power of