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Vertical section of a circumvallate papilla of the calf. Labels: 1 and 3, epithelial layers covering it; 2, taste goblets; 4 and 4', duct of serous gland opening out into the pit in which papilla is situated; 5 and 6, nerves ramifying within the papilla.

Papilla of a Calf

Vertical section of a circumvallate papilla of the calf. Labels: 1 and 3, epithelial layers covering…

From a section through a true salivary gland. Labels: a, the gland alveoli, lined with albuminous "salivary cells;" b, intralobular duct cut transversely.

True Salivary Gland

From a section through a true salivary gland. Labels: a, the gland alveoli, lined with albuminous "salivary…