Superficial examination of microscopic preparations of the glands reveals no histological differences between species.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
These divisions correspond roughly to the threefold study of structure which we nowadays recognize as chemical, histological, and anatomical.
"Fathers of Biology"
Charles McRae
Nowadays we attribute the greatest importance to the morphology of the brain, to its histological structure, the marked development of certain regions, the determination not only of centers but of connections and associations between centers.
"Essay on the Creative Imagination"
Th. Ribot