Sasse, 1977. Chapter 2, Part 3 - Communio sub una and sub utraque (p. 71)

Chapter 2, Part 3 - Communio sub una and sub utraque (p. 71)

There was disagreement between Luther and the Bohemians as regards offering the cup to the laity. For some time, while the Bohemians insisted on both, Luther accepted the communion in one species as valid communion. By 1522 Luther was more interested in requiring that the chalice be available to all the congregation.