 Hamilton effectively invoked a notion of sense data, even if the closest he came terminologically was to speak of the “datum” of consciousness. He accepted most tenets of the Classical Notion, but exceeded that notion in considering the datum to be the physical retinal  image.[10]  He further described positions opposed to his own that are close to positing a sense datum, either as a tertium quid or as a mental representation. He is not clear on whether these purported representative entities would be ascribed the properties they seem to have  (item 3),  but his emphasis on the power of introspective or intuitive consciousness would move him in that direction.