 Just as little as the philosopher can discover the appearances of nature, without examples from experience, merely through a priori inferences, so little can he establish appearances in the beautiful world, if one can thus express oneself, without diligent observations. The securest path of all, just as in the theory of nature, is this: One must assume certain experiences, explain their ground through an hypothesis, then test this hypothesis against experiences from a quite different species, and only assume those hypotheses to be general principles which have thus held their ground; one must finally seek to explain these principles in the theory of nature through the nature of bodies and motion, but in aesthetics through the nature of the lower powers of our soul.  (Review of Meier, pp. 197–8)