[1873] Weinhold, D. F., II, 22.
[1874] Schultz, D. L., 73.
[1875] Migne, Patrol. Latina, XXXII, 1000.
[1876] Scherr, Deutsches Frauenleben, I, 275.
[1877] Jaeger, Ulms Leben im M. A., 544.
[1878] Rudeck, Oeffentl. Sittlichkeit, 26-35.
[1879] Westerhout, Geslachtsleven onzer Voorouders, 198.
[1880] Scherr, Kulturgesch., 223.
[1881] Trevelyan, England in the Age of Wickliffe, 280.
[1882] The origin of this disease being unknown, it has been suggested that it was due to vice and excess in the Middle Ages (Umschau, VII, 71).