A third case should not go unmentioned: our eardrum itself has a characteristic resonance. It varies between people, but is usually an F#2. When an F#2 is sounded, the eardrum is in greatest resonance, and the pitch can be recognized in that manner. This would be a derivation of pitch judgment based on the perception of intensity.
I had never heard this before, but if it's true, it would certainly make sense. This entire section is Abraham blasting the idea of judging a pitch based on its "feeling".
All these indirect criteria-- sound "feeling", pain perception, roughness, and intensity-- are used for pitch judgment only in exceptional cases.
I'll be sure to upload my translation so far before I take off to the airport.