 Three consequent problems can be said to have occupied them chiefly. The first was to avoid the charge of “mentalism” or “panpsychism”. The Idealist contention that materialism is false leads easily to the counter accusation that the world is made of mental stuff. This charge is often leveled at Berkeley, interest in whom greatly increased among Scottish philosophers at this time. Alexander Campbell Fraser, Professor of Logic and Metaphysics at the University of Edinburgh, though not himself an Idealist in philosophy,became editor of a new collected edition of Berkeley's works. Ferrier, Fraser and Seth all denied that Berkeley's immaterialism amounts to mentalism, but it became common to distinguish between “subjective Idealism” and “Absolute Idealism”, the latter being the doctrine the Scottish Idealists espoused.