Also, how the Doctor's cogitating manner was attributable to his being always engaged in looking out for Greek roots; which, in my innocence and ignorance, I supposed to be a botanical furor on the Doctor's part, especially as he always looked at the ground when he walked about, until I understood that they were roots of words, with a view to a new Dictionary which he had in contemplation. Adams, our head-boy, who had a turn for mathematics, had made a calculation, I was informed, of the time this Dictionary would take in completing, on the Doctor's plan, and at the Doctor's rate of going. He considered that it might be done in one thousand six hundred and forty-nine years, counting from the Doctor's last, or sixty-second, birthday.