Letter from T [Tullio] Levi-Civita, Padua, to [Joseph Larmor] He wishes make one small addition to the remark he communcated yesterday. It concerns a point which seems awkward from a mathematical point of view, but which has no significant influence on the result. He explains this in an enclosed document, indicating the place where the addition should be inserted. He apologises for disturbing Larmor for a second time. 22 September 1912