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staying in towns, where they can obtain prostitutes, they will remain
continent until they return home again, a period of perhaps a month."
 Schellong, _Zeitschrift fuer Ethnologie_, 1889, i, pp. 17, 19;
Haddon, _Journal of the Anthropological Institute_, February, 1890, pp.
316, 397; Guise, ib., February and May, 1899, p. 207; Seligmann, ib.,
1902, pp. 298, 301-302; _Reports Cambridge Expedition_, vol. v, pp.
 _Zeitschrift fuer Ethnologie_, 1900, ht. v, p. 414.
 R. Brough Smyth, _The Aborigines of Victoria_, vol. ii, p. 318.
 _Journal of the Anthropological Institute_, 1894, pp. 170, 177, 187.
 _Zeitschrift fuer Ethnologie_, 1896, iv, pp. 180-181.
 W.W. Skeat, _Malay Magic_, p. 524.
 W.F. Daniell, _Medical Topography of Gulf of Guinea_, 1849, p. 55.
 Sir H.H. Johnston, _British Central Africa_, 1899, pp. 409, 414.
 Rev. J.H. Weeks, _Journal of the Anthropological Institute_, 1910,
 Sir A.B. Ellis, _Yoruba-Speaking Peoples_, p. 185.
 W.F. Daniell, op. cit., p. 36.
 _Journal of the Anthropological Institute_, August and November,
1898, p. 106.
 _Zeitschrift fuer Ethnologie_, 1899, ii and iii, p. 84; Velten,
_Sitten und Gebraueche der Suaheli_, p. 12.
 _Zeitschrift fuer Ethnologie_, 1896, p. 364.
 Vambery, _Travels in Central Asia_, 1864, p. 323.
 Heard, _Journal of the Anthropological Institute_, Jan.-June, 1911,
p. 210. The same rule is also observed by the Christians of this district.
 Haddon and Stubbs, _Councils and Ecclesiastical Documents_, vol.
iii, p. 423.
 Jeremy Taylor, _The Rule of Conscience_, bk. iii, ch. iv, rule xx.
Thus it would seem probable that, contrary to a belief once widely
prevalent, the sexual instinct has increased rather than diminished with
the growth of civilization. This fact was clear to the insight of
Lucretius, though it has often been lost sight of since. Yet even
observation of animals might have suggested the real bearing of the facts.
The higher breeds of cattle, it is said, require the male more often than
the inferior breeds. Thorough-bred horses soon reach sexual maturity,
and I understand that since pains have been taken to improve cart-horses
the sexual instincts of the mares have become less trustworthy. There is
certainly no doubt that in our domestic animals generally, which live
under what may be called civilized conditions, the sexual system and the
sexual needs are more developed than in the wild species most closely
related to them. All observers seem to agree on this point, and it is
sufficient to refer to the excellent summary of the question furnished by
Heape in the study of "The 'Sexual Season' of Mammals," to which reference
has already been made. He remarks, moreover, that, "while the sexual
activity of domestic animals and of wild animals in captivity may be more
frequently exhibited, it is not so violent as is shown by animals in the
wild state." So that, it would seem, the greater periodicity of the
instinct in the wild state, alike in animals and in man, is associated
with greater violence of the manifestations when they do appear. Certain
rodents, such as the rat and the mouse, are well known to possess both
great reproductive power and marked sexual proclivities. Heape suggests
that this also is "due to the advantages derived from their intimate
relations with the luxuries of civilization." Heape recognizes that, as
regards reproductive power, the same development may be traced in man: "It
would seem highly probable that the reproductive power of man has
increased with civilization, precisely as it may be increased in the lower
animals by domestication; that the effect of a regular supply of good
food, together with all the other stimulating factors available and
exercised in modern civilized communities, has resulted in such great
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