Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 156. Why The Celebrant Alone Receives Under Both Species — It is clear that the Church was influenced by numerous and most cogent reasons, not only to approve, but also to confirm by authority of its decree, the general practice of communicating under one species. In the first place, the greatest caution was necessary to avoid spilling the blood of the Lord on the ground, a thing that seemed not easily to be avoided, if the chalice were administered in a large assemblage of the people.