Marriage problems are discussed by Giles, _Treatise on Marriage_ (London, 1771); Ryan, _Philosophy of Marriage_ (3d ed., London, 1839); Amat, _Treatise on Matrimony_ (San Francisco, 1864); Watkins, _Holy Matrimony_ (London, 1895); Potwin, "Should Marriage be Indissoluble?" in _New Englander and Yale Review_, LVI (New Haven, 1892); Malcome, _The Christian Rule of Marriage_ (Philadelphia, 1870); Pomeroy, _Ethics of Marriage_ (New York, 1889); Gray, _Husband and Wife_ (2d ed., Boston, 1886); Lea, _Christian Marriage_ (London, 1881); Harte, _Laws and Customs of Marriage_ (London, 1870); Quilter, _Is Marriage a Failure?_ (Chicago, 1889); Colfavru, _Du mariage ... en Angleterre et aux États-Unis_ (Paris, 1868); Carlier, _Le mariage aux États-Unis_ (Paris, 1860); Cook, "Marriage Celebration in the U.S.," and "Reform of the Marriage Celebration," both in _Atlantic_, LXI (Boston, 1888); Snyder, _The Geography of Marriage_ (2d ed., New York and London, 1889); Chavassé, _Traité de l'excellence du mariage_ (Paris, 1685); Gasparin, _Le mariage au point de vue chrétien_ (2d ed., Paris, 1844); Picot, _Le mariage_ (Paris, 1849); Cadet, _Le mariage en France_ (Paris, 1870); Acollas, _Trois leçons ... du mariage_ (Geneva and Berne, 1871); _idem_, _Le mariage_ (Paris, 1880); Sincholle, _Le mariage civil et le mariage religieux_ (Poitiers, 1876); Legrand, _Le mariage et les mœurs en France_ (Paris, 1879); Hayem, _Le mariage_ (Paris, 1872); Schoelcher, _La famille, la propriété, et le christianisme_ (Paris, 1875); Hippel, _Ueber die Ehe_ (4th ed., Frankfort and Leipzig, 1794); Volkmar, _Philosophie der Ehe_ (Halle, 1794); Krug, _Philosophie der Ehe_ (Reutlingen, 1801); Jörg and Tzschirner, _Die Ehe aus dem Gesichtspunkte der Natur, der Moral, und der Kirche_ (Leipzig, 1819); Stäudlin, _Geschichte der Vorstellungen und Lehren von der Ehe_ (Göttingen, 1826); Liebetrut, _Die Ehe nach ihrer Idee und nach ihrer geschichtlichen Entwicklung_ (Berlin, 1834); Marr, _Der Mensch und die Ehe_ (Leipzig, 1848); Hoffmann, _Die christliche Ehe_ (Berlin, 1860); Glock, _Die christliche Ehe und ihre modernen Gegner_ (Karlsruhe and Leipzig, 1881). Socialistic writers on the subject are Robert Owen, _Marriages of the Priesthood of the Old Immoral World_ (4th ed., Leeds, 1840); Robert Dale Owen, "Marriage and Placement," in _Free Inquirer_, May 28 (New York, 1831); Pearson, _Ethic of Free Thought_ (London, 1888); Besant, _Marriage; As It Was, As It Is, and As It Should Be_; Gronlund, _The Co-operative Commonwealth_ (3d ed., London, 1891); Morris and Bax, _Socialism_ (London and New York, 1893); Carpenter, _Love's Coming of Age_; Stürmer, _Moderner Eheschacher_ (Leipzig, 1894); Proudhon, _Amour et mariage_ (Brussels and Leipzig, n. d.); and Bebel, _Die Frau und der Sozialismus_ (31st ed., Stuttgart, 1900), whose book is discussed by Oettingen, _Zur Theorie und Praxis des Heiratens_ (Leipzig, n. d.). See also Oettingen's _Obligatorische und fakultative Civilehe nach den Ergebnissen der Moralstatistik_ (Leipzig, 1881); Coulon, _De la réforme du mariage_ (Paris, 1900); Kuhlenbeck, _Reform der Ehe_ (Leipzig, 1891); Ewart, _Die Emancipation in der Ehe_ (Hamburg and Leipzig, 1895); Vortmann, _Die Reform der Ehe_ (Zürich, 1894); Lacombe, _Le mariage libre_ (Paris, 1867); Löwenherz, _Prostitution oder Production, Eigentum oder Ehe_ (Neuwied, n. d.); especially the able and radical works of Caird, _The Morality of Marriage_ (London, 1897); Stetson, _Women and Economics_ (Boston, 1900); and Schreiner, "The Woman Question," in _Cosmopolitan_, XXVIII (Irvington, 1899); _idem_, "The Woman's Movement of Our Day," in _Harper's Bazar_, XXXVI (New York, 1902). Swedenborg's system is set forth in his _Conjugal Love and its Chaste Delights_ (new ed., London, 1862); it is summarized by Hayden, _Ten Chapters on Marriage_ (2d ed., Boston, 1863); and expounded by Mann, _Five Sermons on Marriage_ (New York, 1882).