The researches by which Sir Joseph Larmor will chiefly be remembered belong to the decade 1892–1901, which is now recognized as a transition period in physics. ... Before the end of the decade X-rays, electrons and radio-activity had again set experimental physics in feverish progress, to be followed later by revolutionary changes in the foundations of physical theory. But at the time when Larmor started on his main work there was little to inspire new ideas. ... Classical physics was indeed near the end of its tether. Of those who yet contrived to make substantial progress at this difficult stage—who brought classical physics finally to the point where new methods became inevitable—two names stand out prominently, Lorentz and Larmor. Their work had much in common, so that it is sometimes difficult to assess their contributions separately. Larmor’s reputation has perhaps been overshadowed by that of Lorentz. But on any estimate, Larmor’s achievements rank high; and his place in science is secure as one who re-kindled the dying embers of the old physics to prepare the advent of the new.