Retrograde motions, [xii. 5. 5]. [xxv. 6]. [xxix. 11].
—— of the stomach, [xxv. 6].
—— of the skin, [xxv. 9].
—— of fluids, how distinguished, [xxix. 8].
—— how caused, [xxix. 11. 5].
—— vegetable motions, [xxix. 9].
Retina is fibrous, [iii. 2]. [xl. 1].
—— is active in vision, [iii. 3]. [xl. 1].
—— excited into spasmodic motions, [xl. 7].
—— is sensible during sleep, [xviii. 5]. [xix. 8].