This article deals with the text and interpretation of 52 passages of the Scriptores Historiae Augustae and for most of these passages proposes a new emendation. The following modern editions are referred to: H. Peter (Leipzig 1884), D. Magie (Loeb edition 1922-1932), E. Hohl (Leipzig 1927), J.P. Callu (Budé edition, Vol. I.1, 1992). Lessing = K. Lessing Scriptorum historiae Augustae Lexicon (Leipzig 1901-1906). SB = D.R. Shackleton Bailey ‘Notes on the Historia Augusta’ Eranos 81 (1983) 117-30.