These letters are from Rutherford to Bertram Borden Boltwood, the Yale University chemist who worked with Rutherford on his scientific study of radioactivity and the structure of the atom. There is much information concerning professional activities and colleagues.

These are notes of lectures and experiments made at Paris as a student at the Jardin des Plantes. The volumes are entitled: Botany & Agriculture (with a large portion actually on electrical machinery); Trees and Shrubs; Chemistry, Physics, Mineralogy; and Zoology.