perceptional

What it would be really interesting, and I dare say admirably difficult, to go into would be the very history of this effect of experience; the history, in other words, of the growth of the immense array of terms, perceptional and expressional, that, after the fashion I have indicated, in sentence, passage and page, simply looked over the heads of the standing terms—or perhaps rather, like alert winged creatures, perched on those diminished summits and aspired to a clearer air.