1913, Royal Society of Arts, Journal of the Royal Society of Arts...found it necessary to discard the treeiness of the tree and the grassiness of the grass.
1970, Morse Peckham, The triumph of Romanticism: collected essaysWhen we try to say what a tree is, we can only say that a tree is a manifestation of treeiness.
1974, Beatrice Kean Seymour, Summer of lifeYou know what I mean, anyway — 'the treeiness of the tree.' But I don't believe he's seen a picture by either.