Perles' essays are rich in suggestiveness, and have been the starting-point of much fruitful research.
We do not know; but there is a pathetic suggestiveness in a passage in the Magna Moralia (i.
He showed his versatility in landscape, as in his "Whins in Bloom," which combined great breadth with fine detail; in flower-pieces, such as his "Roses," which were brilliant in rapid suggestiveness and force; but most of all in his portraits, which are marked by great individuality, and by fine insight into character.
But much more it belongs to his transformation of the epistemological problem, and to the suggestiveness of his philosophy as a whole for an advance in the direction of a speculative construction which should be able to cancel all Kant's surds, and in particular vindicate a " ground of the unity of the supersensible which lies back of nature with that which the concept of freedom implies in the sphere of practice," I which is what Kant finally asserts.
The outstanding feature of the mental life of savages known to psychologists as " primitive credulity " is doubtless chiefly due to sheer want of diversity of suggestiveness in their intellectual surroundings.
Amongst his economic works may be mentioned Money and the Mechanism of Exchange (1875), written in a popular style, and descriptive rather than theoretical, but wonderfully fresh and original in treatment and full of suggestiveness, a Primer on Political Economy (1878), The State in Relation to Labour (1882), and two works published after his death, namely, Methods of Social Reform and Investigations in Currency and Finance, containing papers that had appeared separately during his lifetime.
Apart from the positive and permanent value of the higher unities which he succeeds in establishing, the light and suggestiveness of his discussions and treatment of the great points at issue in all the principal fields of human thought, unsatisfactory as many of his positions may be considered, make him one of the most helpful and instructive of modern thinkers.