Cytology (q.v.), the intimate structure and behaviour of the cell and its contents - protoplasm, nucleus, &c.
The cytology of bone marrow, with the technique of blood examination, is of great assistance in the diagnosis of different pathological conditions.
Williams, " Contributions to our Knowledge of the Lifehistory and Cytology of Fucaceae," Phil.
But practical necessity has given rise to the existence of many other divisions; see CYTOLOGY, for the structure of cells; EMBRYOLOGY, for the development of individual organisms; HEREDITY and REPRODUCTION, for the relations between parents and offspring.