This monograph examines intra-confessional Lutheran disputes over the theology and practice of the Lord's Supper within the sixteenth century. In 1561 the city of Danzig became embroiled in theological controversy when one Lutheran minister criticised a colleague for improperly disposing of the consecrated elements and for denying the continued real presence of Christ after consecration. The criticism set off a wide-ranging debate over when Christ becomes present in the elements, how long Christ remains present in the elements, and how church practices, such as adoration of the elements, both shaped and were shaped by these theological niceties. The bulk of the book examines the intricacies of these theological and practical questions through the lens of intellectual history (ch. ii), but also examines how certain social and cultural factors, such as the large number of Reformed merchants in the city, may have impacted upon the debate (ch. iii). The other two chapters situate the Danzig controversy within the larger process of Lutheran confessionalisation. Chapter i briefly outlines two strands of interpretation within Lutheranism concerning the Lord's Supper that became evident in the Danzig controversy, one following Luther and the other following Melanchthon. Chapter iv traces how themes from chapter ii, particularly Lutheran views of exum usus, were consolidated, or purposefully ignored, in the period of Lutheran orthodoxy. This chapter, along with the conclusion, situates the Danzig controversy within larger historiographical topics, especially the process of confessionalisation. There is also an appendix/excursus concerning English debates over the Black Rubric and how those debates mirrored some of the concerns present in Danzig. Chapter iii is the weakest part of the book. It attempts to do too much by situating the Danzig debate within a myriad of social and cultural factors and does not do enough to attach them back to other discussions found in the book. The chapter also feels out of place in that it breaks up the overall intellectual history of the Lord's Supper that the other chapters chart. Despite this minor criticism, the book presents an intriguing, nuanced perspective on how Lutheran theology and practice of the Lord's Supper was in the process of development and consolidation throughout the sixteenth century.