Abstract

This passage occurs in a series of examples of optical illusions which Lucretius provides in order to illustrate the way in which the mind can misinterpret the evidence of the senses. There are no manuscript variations relevant to the problem which I wish to discuss. The situation envisaged is that in fording a swift river, a horse has come to a halt in mid-stream. ‘We’, that is, the rider, look down into the rushing water and get the impression that our horse is moving sideways and upstream, although the horse is in fact stationary. And wherever we turn our eyes across the water, everything seems to be in motion. The question is, what is meant by the word ‘everything’, that is, omnia in line 424? Bailey interprets: ‘when after looking down for some time at the rushing stream, we then look up at the objects on the bank, they all seem to be moving.! Similarly Leonard and Smith take the reference to be to’ all objects on the bank or all stones, etc., sticking out of the stream.’ In this case the words ‘assimili nobis ratione’ must be taken closely together: the objects on the bank seem to be moving upstream in the same way that we ourselves appear to do