n p.59 he talks specifically about minimum magnitudes devoid of parts (ta elachista kai amere).
Hicks has:
τὰ ἐλάχιστα καὶ ἀμιγῆ (ta elachista kai amigē)
This might be one to check the papyri later.
Henry George Liddell, Robert Scott, A Greek-English Lexicon, ἀμι^γής