From Chapter IV., Parmenides of Elea
96. Alcmaeon of Croton
Alkmaion's importance really lies in the fact that he is the founder of empirical psychology.73 He regarded the brain as the common sensorium, a view which Hippokrates and Plato adopted from him, though Empedokles, Aristotle, and the Stoics reverted to the more primitive view that the heart is the central organ of sense. There is no reason to doubt that he made this discovery by anatomical means. We have authority for saying that he practised dissection, and, though the nerves were not yet recognised as such, it was known that there were certain "passages" (πόροι) which might be prevented from communicating sensations to the brain by lesions.74 He also distinguished between sensation and understanding, though we have no means of knowing where he drew the line between them. His theories of the special senses are of great interest. We find in him already, what is characteristic of Greek theories of vision as a whole, the attempt to combine the view of vision as a radiation proceeding from the eye with that which attributes it to an image reflected in the eye. He knew the importance of air for the sense of hearing, though he called it the void, a thoroughly Pythagorean touch. With regard to the other senses, our information is more [/195] scanty, but sufficient to show that he treated the subject systematically.75
His astronomy seems very crude for one who stood in close relations with the Pythagoreans. We are told that he adopted Anaximenes' theory of the sun and Herakleitos's explanation of eclipses.76 If, however, we were right in holding that the Second Part of the poem of Parmenides represents the view of Pythagoras, we see that he had not gone very far beyond the Milesians in such matters. His theory of the heavenly bodies was still "meteorological." It is all the more remarkable that Alkmaion is credited with the view that the planets have an orbital motion in the opposite direction to the diurnal revolution of the heavens. This view, which he may have learnt from Pythagoras, would naturally be suggested by the difficulties we noted in the system of Anaximander.77 It doubtless stood in close connexion with his saying that soul was immortal because it resembled immortal things, and was always in motion like the heavenly bodies.78 He seems, in fact, to be the author of the curious view Plato put into the mouth of the Pythagorean Timaios, that the soul has circles in it revolving just as the heavens and the planets do. This too seems to be the explanation of his further statement that man dies because he cannot join the beginning to the end.79 The orbits of the heavenly bodies always come full circle, but the circles in the human head may fail to complete themselves.
Alkmaion's theory of health as "isonomy" is at once that which most clearly connects him with earlier inquirers like Anaximander, and also that which had the greatest influence on the subsequent development of philosophy. He observed, to begin with, that "most things human were two," and by this he meant that man was made up of the hot and the cold, the moist and the dry, and the rest of the opposites.80 Disease was just the "monarchy" of any one of these—the same thing that Anaximander had called "injustice"—while health was the establishment in the body of a free government with equal laws.81 This was the leading doctrine or the Sicilian school of medicine, and we shall have to consider in the sequel its influence on the development of Pythagoreanism. Taken along with the theory of "pores," it is of the greatest importance for later science.
69. On Alkmaion, see especially Wachtler, De Alcmaeone Crotoniata (Leipzig, 1896).
70. Arist. Met. A, 5. 986 a 27 (R. P. 66). In a 30 Diels reads, with great probability, ἐγένετο τὴν ἡλικίαν <νέος> ἐπὶ γέροντι Πυθαγόρα. Cf. Iambl. V. Pyth. 104, where Alkmaion is mentioned among the συγχρονίσαντες καὶ μαθητεύσαντες τῷ Πυθαγόρᾳ πρεσβύτῃ νέοι.
71. Ἀλκμαίων Κροτωνιήτης τάδε ἔλεξε Πειρίθου υἱὸς Βροτίνῳ καὶ Λέοντι καὶ Βαθύλλῳ· περὶ τῶν ἀφανέων, περὶ τῶν θνητῶν, σαφήνειαν μὲν θεοὶ ἔχοντι, ὡς δὲ ἀνθρώποις τεκμαίρεσθαι καὶ τὰ ἑξῆς (fr. 1, Diels, Vors. 14 b 1). The fact that this is not written in conventional Doric is a strong proof of its genuineness.
72. Brotinos (or Brontinos) is variously described as the son-in-law or father-in-law of Pythagoras. Leon is one of the Metapontines in the catalogue of Iamblichos (Diels, Vors. 45 A), and Bathyllos is presumably the Poseidoniate Bathylaos also mentioned there.
73. Everything bearing on the early history of this subject is brought together and discussed in Prof. Beare's Greek Theories of Elementary Cognition, to which I must refer the reader for all details.
74. Theophr. De sens. 26 (Beare, p. 252, n. 1). Our authority for the dissections of Alkmaion is only Chalcidius, but he gets his information on such matters from far older sources. The πόροι and the inference from lesions are vouched for by Theophrastos.
75. The details will be found in Beare, pp. 11 sqq. (vision), pp. 93 sqq. (hearing), pp. 131 sqq. (smell), pp. 180 sqq. (touch), pp. 160 sqq. (taste).
76. Aet. ii. 22, 4, πλατὺν εἶναι τὸν ἥλιον; 29, 3, κατὰ τὴν τοῦ σκαφοειδοῦς στροφὴν καὶ τὰς περικλίσεις (ἐκλείπειν τὴν σελήνην).
77. Aet. ii. 16, 2, (τῶν μαθηματικῶν τινες) τοὺς πλανήτας τοῖς ἀπλάνεσιν ἀπὸ δυσμῶν ἐπ' ἀνατολὰς ἀντιφέρεσθαι. τούτῳ δὲ συνομολογεῖ καὶ Ἀλκμαίων. For the difficulties in Anaximander's system see p. 69 sq.
78. Arist. De an. A, 2. 405 a 30 (R. P. 66 c).
79. Arist. Probl. 17, 3. 916 a 33, τοὺς ἀνθρώπους φησὶν Ἀλκμαίων διὰ τοῦτο ἀπόλλυσθαι, ὅτι οὐ δύνανται τὴν ἀρχὴν τῷ τέλει προσάψαι.
80. Arist. Met. A, 5. 986 a 27 (R. P. 66).
81. Aet. v. 30, I,
Ἀλκμαίων τῆς μὲν ὑγιείας εἶναι συνεκτικὴν τὴν ἰσονομίαν τῶν δυνάμεων, ὑγροῦ, ξηροῦ, ψυχροῦ, θερμοῦ, πικροῦ, γλυκέος, καὶ τῶν λοιπῶν, τὴν δ' ἐν αὐτοῖς μοναρχίαν νόσου ποιητικήν· φθοροποιὸν γὰρ ἑκατέρου μοναρχίαν.
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