LITURGIES

Liturgies: The formal, established rituals and sequences of public worship in the Christian Church, particularly those related to the celebration of the Eucharist or Holy Communion.

EASTERN AND WESTERN

This refers to the two great branches of historic Christian practice: the "Eastern" traditions (including the Greek, Syrian, Coptic, and Armenian rites) and the "Western" traditions (including the Roman, Ambrosian, and Gallican rites).

HAMMOND

original: C. E. Hammond. This refers to Charles Edward Hammond (1837–1914), a scholar who compiled these ancient and medieval prayer services to help readers study the development of Christian worship.

This "a" is a signature mark, used by early printers to help binders assemble the pages of a book in the correct order.