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Most of us take it for granted that we ought to be rational—to have the bundle of dispositions and abilities that constitute the faculty of rationality. Most of us also take it for granted that we ought to satisfy various individual requirements of rationality: we ought not to believe it is Monday and also believe it is not Monday; we ought to intend to catch the 12.50, if we intend to get to a...

Pryor, M. G. M. 19406 Proc. Roy. Soc. B, 128, 393-407. Ram say, J . A. 1935 J • E xp . Biol. 12, 373—383. R ichards, A. G. & Anderson, T. F . 1942 J . M orph. 71, 135-183. Schultze, P . 1913 Verh. dtsch. zool. Ges. pp. 165-195. W igglesworth, V. B. 1933 Quart. J . M icr. Sci. 76, 270—318. W igglesworth, V. B. 1942 J . E xp . Biol. 19, 56—77. W igglesworth, V. B. 1945 J . E xp . Biol. 21, 97—114...

β-expansions and ultimately periodic