Section through the lymphoid tissue of a solitary gland. Labels: a, center of the gland, with the lymphoid tissue fallen away; b, epithelium of mucous membrane; c, c, villi, with epithelium partly broken away; d, crypts, or glands, of Lieberkuhn.

Lymphoid Tissue

Section through the lymphoid tissue of a solitary gland. Labels: a, center of the gland, with the lymphoid…