 There are difficulties with the text of Fr. 1, which make its interpretation problematic. Some scholars exclude the material in brackets above because it is hard to see how to connect it to what precedes (e.g., Wachtler 1896), while others keep the material and suppose that we are to understand an “and” coordinating the phrase in brackets with what precedes it (e.g., DK 1952). Other scholars would place a semicolon or colon after “things that are not perceptible” so that up to the colon Alcmaeon is identifying his topic or the area of disagreement with this addressees, while after the colon he begins his own account (Kouloumentas 2018 following Gomperz). Gemelli Marciano (2007, 18–22), on the other hand, has suggested that the material in brackets above should be kept but made dependent on the immediately preceding phrase rather than coordinated with it, so that the fragment would read: