Northern Antiquities, p. 259; Journal of Geographical Society, vol. xv. p. 45, vol. xvi. p. 307; Southey's Commonplace Book, third series, p. 579.
311
On this question a variety of conflicting statements may be seen in the old writers. Goodman, early in the seventeenth century, supposed that more females were born than males. Southey's Commonplace Book, third series, p. 696. Turgot (Œuvres, vol. ii. p. 247) rightly says, ‘il naît un peu plus d'hommes que de femmes;’ but the evidence was too incomplete to make this more than a lucky guess; and I find that even Herder, writing in 1785, takes for granted that the proportion was about equal: ‘ein ziemliches Gleichmass in den Geburten beider Geschlechter’ (Ideen zur Geschichte, vol. ii. p. 149), and was sometimes in favour of girls, ’ja, die Nachrichten mehrerer Reisenden machen es wahrscheinlich, dass in manchen dieser Gegenden wirklich mehr Töchter als Söhne geboren werden.’
312
A question, indeed, has been raised as to the influence exercised by the state of the mind during the period of orgasm. But whatever this influence may be, it can only affect the subsequent birth through and by physical antecedents, which in every case must be regarded as the proximate cause. If, therefore, the influence were proved to exist, we should still have to search for physical laws: though such laws would of course be considered merely as secondary ones, resolvable into some higher generalization.
313
Some writers treat physiology as a study of the laws of life. But this, looking at the subject as it now stands, is far too bold a step, and several branches of knowledge will have to be raised from their present empirical state, before the phenomena of life can be scientifically investigated. The more rational mode seems to be, to consider physiology and anatomy as correlative; the first forming the dynamical, and the second forming the statical part of the study of organic structure.
314
‘Voulez-vous savoir de quoi dépend le sexe des enfants? Fernel vous répond, sur la foi des anciens, qu'il dépend des qualités de la semence du père et de la mère.’ Renouard, Histoire de la Médecine, Paris, 1846, vol. ii. p. 106; see also, at p. 185, the opinion of Hippocrates, adopted by Galen; and similar views in Lepelletier, Physiologie Médicale, vol. iv. p. 332, and Sprengel, Hist. de la Médecine, vol. i. pp. 252, 10, vol. ii. p. 115, vol. iv. p. 62. For further information as to the opinions which have been held respecting the origin of sexes, see Beausobre, Histoire de Manichée, vol. ii. p. 417; Asiatic Researches, vol. iii. pp. 358, 361; Vishnu Purana, p. 349; Works of Sir William Jones, vol. iii. p. 126; Ritter's History of Ancient Philosophy, vol. iii. p. 191; Denham and Clapperton's Africa, pp. 323, 324; Maintenon, Lettres Inédites, vol. ii. p. 62; and the view of Hohl (Burdach's Physiologie, vol. ii. p. 472), ‘que les femmes chez lesquelles prédomine le système artériel procréent des garçons, au lieu que celles dont le système veineux a la prédominance mettent au monde des filles.’ According to Anaxagoras the question was extremely simple: καὶ ἄρρενα μὲν ἀπὸ τῶν δεξιῶ,θήλεα δὲ ἀπὸ τῶν ἀριστερῶν. Diog. Laert. ii. 9, vol. i. p. 85.
315
‘Le metaphysicien se voit comme la source de l'évidence et le confident de la nature: Moi seul, dit-il, je puis généraliser les idées, et découvrir le germe des événements qui se développent journellement dans le monde physique et moral; et c'est par moi seul que l'homme peut être éclairé.’ Helvetius, de l'Esprit, vol. i. p. 86. Compare Herder, Ideen zur Geschichte der Menschheit, vol. ii. p. 105. Thus, too, M. Cousin (Hist. de la Philosophie, II. série, vol. i. p. 131) says, ‘Le fait de la conscience transporté de l'individu dans l'espèce et dans l'histoire, est la clef de tous les développements de l'humanité.’
316
Considering the very long period during which physiology has been studied, it is remarkable how little the physiologists have contributed towards the great and final object of all science, namely, the power of predicting events. To me it appears that the two principal causes of this are, the backwardness of chemistry, and the still extremely imperfect state of the microscope, which even now is so inaccurate an instrument, that when a high power is employed, little confidence can be placed in it; and the examination, for instance, of the spermatozoa has led to the most contradictory results. In regard to chemistry, MM. Robin and Verdeil, in their recent great work, have ably proved what manifold relations there are between it and the further progress of our knowledge of the animal frame; though I venture to think that these eminent writers have shown occasionally an undue disposition to limit the application of chemical laws to physiological phenomena. See Robin et Verdeil, Chimie Anatomique et Physiologique, Paris, 1853, vol. i. pp. 20, 34, 167, 337, 338, 437, 661, vol. ii. pp. 136, 137, 508, vol. iii. pp. 135, 144, 183, 281, 283, 351, 547. The increasing tendency of chemistry to bring under its control what are often supposed to be purely organic phenomena, is noticed cautiously in Turner's Chemistry, vol. ii. p. 1308, London, 1847; and boldly in Liebig's Letters on Chemistry, 1851, pp. 250, 251. The connexion between chemistry and physiology is touched on rather too hastily in Bouilland, Philosophie Médicale, pp. 160, 257; Broussais, Examen des Doctrines Médicales, vol. iii. p. 166; Brodie's Lectures on Pathology, p. 48; Henle, Traité d'Anatomie, vol. i. pp. 25, 26; Feuchtersleben's Medical Psychology, p. 88; but better in Holland's Medical Notes, 1839, p. 270, a thoughtful and suggestive work. On the necessity of chemistry for increasing our knowledge of embryology, compare Wagner's Physiology, pp. 131, 132 note, with Burdach, Traité de Physiologie, vol. iv. pp. 59, 168.
317
It used to be supposed that some of the eastern countries formed an exception to this; but more precise observations have contradicted the loose statements of the earlier travellers, and in no part of the world, so far as our knowledge extends, are more girls born than boys; while in every part of the world for which we have statistical returns, there is a slight excess on the side of male births. Compare Marsden's History of Sumatra, p. 234; Raffles' History of Java, vol. i. pp. 81, 82; Sykes on the Statistics of the Deccan, in Reports of British Association, vol. vi. pp. 246, 261, 262; Niebuhr, Description de l'Arabie, p. 63; Humboldt, Nouv. Espagne, vol. i. p. 139; McWilliam, Medical History of Expedition to the Niger, p. 113; Elliotson's Human Physiology, p. 795; Thomson's Hist. of Royal Society, p. 531; Sadler's Law of Population, vol. i. pp. 507, 511, vol. ii. pp. 324, 335; Paris and Fonblanque's Medical Jurisprudence, vol. i. p. 259; Journal of Statist. Soc. vol. iii. pp. 263, 264, vol. xvii. pp. 46, 123; Journal of Geographical Soc. vol. xx. p. 17; Fourth Report of British Association, pp. 687, 689, Report for 1842, pp. 144, 145; Transac. of Sections for 1840, p. 174, for 1847, p. 96, for 1849, p. 87; Dufau, Traité de Statistique, pp. 24, 209, 210; Burdach, Traité de Physiologie, vol. ii. pp. 56, 57, 273, 274, 281, vol. v. p. 373; Hawkins's Medical Statistics, pp. 221, 222.
318
In Müller's Physiology, vol. ii. p. 1657, a work of great authority, it is said, that ‘the causes which determine the sex of the embryo are unknown, although it appears that the relative age of the parents has some influence over the sex of the offspring.’ That the relative age of the parents does affect the sex of their children, may, from the immense amount of evidence now collected, be considered almost certain; but M. Müller, instead of referring to
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