and not the physiologists, were the first to make this discovery. On this curious question, see Carpenter's Human Physiology, p. 746; Sadler's Law of Population, vol. ii. pp. 333, 336, 342; Journal of Statistical Society, vol. iii. pp. 263, 264. In regard to animals below man, we find from numerous experiments, that among sheep and horses the age of the parents ‘has a very great general influence upon the sex’ of the offspring. Elliotson's Physiology, pp. 708, 709; and see Cuvier, Progrès des Sciences Naturelles, vol. ii. p. 406. As to the relation between the origin of sex and the laws of arrested development, compare Geoffroy Saint-Hilaire, Hist. des Anomalies de l'Organisation, vol. ii. pp. 33, 34, 73, vol. iii. p. 278, with Lindley's Botany, vol. ii. p. 81. In Esquirol, Maladies Mentales, vol. i. p. 302, there is a singular case recorded by Lamotte, which would seem to connect this question with pathological phenomena, though it is uncertain whether the epilepsy was an effect or a cognate symptom.
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That the natural powers of the human brain are improving because they are capable of transmission, is a favourite doctrine with the followers of Gall, and is adopted by M. A. Comte (Philosophie Positive, vol. iv. pp. 384, 385); who, whoever, admits that it has never been sufficiently verified: ‘sans que toutefois l'expérience ait encore suffisamment prononcé.’ Dr. Prichard, whose habits of thought were very different, seems, nevertheless, inclined to lean in this direction; for his comparison of skulls led him to the conclusion, that the present inhabitants of Britain, ‘either as the result of many ages of greater intellectual cultivation, or from some other cause, have, as I am persuaded, much more capacious braincases than their forefathers.’ Prichard's Physical History of Mankind, vol. i. p. 305. Even if this were certain, it would not prove that the contents of the crania were altered, though it might create a presumption; and the general question must, I think, remain unsettled until the researches begun by Blumenbach, and recently continued by Morton, are carried out upon a scale far more comprehensive than has hitherto been attempted. Compare Burdach, Traité de Physiologie, vol. ii. p. 253; where, however, the question is not stated with sufficient caution.
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None of the laws of hereditary descent connected with the formation of character, have yet been generalized; nor is our knowledge much more advanced respecting the theory of temperaments, which still remains the principal obstacle in the way of the phrenologists. The difficulties attending the study of temperaments, and the obscurity in which this important subject is shrouded, may be estimated by whoever will compare what has been said upon it by the following writers: Müller's Physiology, vol. ii. pp. 1406–1410; Elliotson's Human Physiology, pp. 1059–1062; Blainville, Physiologie Générale et Comparée, vol. i. pp. 168, 264, 265, vol. ii. pp. 43, 130, 214, 328, 329, vol. iii. pp. 54, 74, 118, 148, 149, 284, 285; Williams's Principles of Medicine, pp. 16, 17, 112, 113; Geoffroy Saint-Hilaire, Anomalies de l'Organisation, vol. i. pp. 186, 190; Broussais, Examen des Doctrines Médicales, vol. i. pp. 204, 205, vol. iii. p. 276; Renouard, Hist. de la Médecine, vol. i. p. 326; Sprengel, Hist. de la Médecine, vol. i. p. 380, vol. ii. p. 408, vol. iii. p. 21, vol. v. p. 325, vol. vi. p. 492; Esquirol, Maladies Mentales, vol. i. pp. 39, 226, 429, 594, vol. ii. p. 29; Lepelletier, Physiol. Médicale, vol. i. pp. 139, 281, vol. iii. pp. 372–429, vol. iv. pp. 93, 123, 133, 143, 148, 177; Henle, Anatomie Générale, vol. i. p. 474, vol. ii. pp. 288, 289, 316; Bichat, Anatomie Générale, vol. i. p. 207, vol. ii. p. 444, vol. iii. pp. 310, 507, vol. iv. pp. 281, 399, 400, 504; Bichat sur la Vie, pp. 80, 81, 234, 235; Phillips on Scrofula, p. 9; Feuchtersleben's Medical Psychology, pp. 143–145; Œuvres de Fontenelle, Paris, 1766, vol. v. p. 110; Cullen's Works, Edinb. 1827, vol. i. pp. 214–221; Cabanis, Rapports du Physique et du Moral, pp. 76–83, 229–261, 520–533; Noble on the Brain, pp. 370–376; Combe's North America, vol. i. pp. 126–128. Latterly, attention has been paid to the chemistry of the blood as it varies in the various temperaments; and this seems a more satisfactory method than the old plan of merely describing the obvious symptoms of the temperament. Clark on Animal Physiology, in Fourth Report of the British Association, p. 126; Simon's Animal Chemistry, vol. i. p. 236; Wagner's Physiology, p. 262.
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We often hear of hereditary talents, hereditary vices, and hereditary virtues; but whoever will critically examine the evidence will find that we have no proof of their existence. The way in which they are commonly proved is in the highest degree illogical; the usual course being for writers to collect instances of some mental peculiarity found in a parent and in his child, and then to infer that the peculiarity was bequeathed. By this mode of reasoning we might demonstrate any proposition; since in all large fields of inquiry there are a sufficient number of empirical coincidences to make a plausible case in favour of whatever view a man chooses to advocate. But this is not the way in which truth is discovered; and we ought to inquire not only how many instances there are of hereditary talents, &c. but how many instances there are of such qualities not being hereditary. Until something of this sort is attempted, we can know nothing about the matter inductively: while, until physiology and chemistry are much more advanced, we can know nothing about it deductively.
These considerations ought to prevent us from receiving statements (Taylor's Medical Jurisprudence, pp. 644, 678, and many other books) which positively affirm the existence of hereditary madness and hereditary suicide; and the same remark applies to hereditary disease (on which see some admirable observations in Phillips on Scrofula, pp. 101–120, London, 1846); and with still greater force does it apply to hereditary vices and hereditary virtues; inasmuch as ethical phenomena have not been registered as carefully as physiological ones, and therefore our conclusions respecting them are even more precarious.
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To what has been already stated, I will add the opinions of two of the most profound among modern thinkers. ‘Men, I think, have been much the same for natural endowments in all times.’ Conduct of the Understanding, in Locke's Works, vol. ii. p. 361. ‘Les dispositions primitives agissent également chez les peuples barbares et chez les peuples policés; ils sont vraisemblablement les mêmes dans tous les lieux et dans tous les tems… Plus il y aura d'hommes, et plus vous aurez de grands hommes ou d'hommes propres à devenir grands.’ Progrès de l'Esprit Humain, in Œuvres de Turgot, vol. ii. p. 264. The remarks of Dr. Brown (Lectures on the Mind, p. 57), if I rightly understand his rhetorical language, apply not to natural capacity, but to that which is acquired: see the end of his ninth Lecture.
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That the system of morals propounded in the New Testament contained no maxim which had not been previously enunciated, and that some of the most beautiful passages in the Apostolic writings are quotations from pagan authors, is well known to every scholar; and so far from supplying, as some suppose, an objection against Christianity, it is a strong recommendation of it, as indicating the intimate relation between the doctrines of Christ and the moral sympathies of mankind in different ages. But to assert that Christianity communicated to man moral truths previously unknown, argues, on the part of the assertor, either gross ignorance or else wilful fraud. For evidence of the knowledge of moral truths possessed by barbarous nations, independently of Christianity, and for the most part previous to its promulgation, compare Mackay's Religious Development, vol. ii. pp. 376–380; Mure's Hist. of Greek Literature, vol. ii. p. 398, vol. iii. p. 380; Prescott's History of Mexico, vol. i. p. 31; Elphinstone's History of India, p. 47; Works of Sir W. Jones, vol. i. pp. 87, 168, vol. iii. pp. 105, 114; Mill's History of India, vol. i. p. 419; Bohlen,
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