Bone Marrow and Peripheral Blood.- Structure and function.- Regulation of Hemopoiesis.- Evaluation of Blood and Bone Marrow, Rat.- Normal Blood Cell Values, Rat.- Neoplasms.- Granulocytic Leukemia, Rat.- Granulocytic Leukemia, Mouse.- Megakaryocytic Leukemia, Mouse.- Histiocytic Sarcoma, Rat.- Histiocytic Sarcoma, Mouse.- Nonneoplastic Lesions.- Myelofibrosis, Mouse.- Chédiak-Higashi Syndrome, Mouse.- Assessment of Toxicologic Effects upon Bone Marrow and Related Tissues.- Parasites.- Hemobartonellosis and Eperythrozoonosis.- Trypanosoma Brucei Infection, Mouse.- Lymph Nodes.- Structure and function.- Identification and Functional Characteristics of Lymphocytes with Natural Killer Activity.- Identification and Functional Characteristics of T Lymphocytes.- B-Cell Function and Ontogeny.- Identification and Functional Characteristics of Monocytes/Macrophages.- Immunohistochemistry, Lymphoid Cells, Mouse.- Sources of Antibodies and Immunological Reagents Used for Immunohistochemistry.- Normal Anatomy, Histology, Immunohistology, and Ultrastructure, Lymph Node, Rat.- Neoplasms.- Classification of Mouse Lymphoid Cell Neoplasms.- Immunoblastic Lymphoma, Ileocecal Lymph Nodes, LOU/C Rat.- Follicular Center Cell Lymphoma, Mouse.- A Morphologic Classification of Hemopoietic Tumors, Rats.- Nonneoplastic Lesions.- Classification of Reactive Lesions of Lymph Nodes.- Autoimmune Hemolytic Anemia, NZB Mice.- Toxic Effects on the Immune System, Rat.- Spleen.- Structure and Function.- Normal Anatomy, Histology, Ultrastructure, Rat.- Neoplasms.- Large Granular Lymphocyte Leukemia, Rat.- Immunohistochemistry of Large Granular Lymphocyte Leukemia, Rat.- Mast Cell Neoplasms, Mouse.- Erythroleukemia, Mouse.- Early Follicular Center Cell Lymphoma, Mouse.- Fibrosarcoma, Spleen, Rat.-Nonneoplastic Lesions.- Classification of Reactive Lesions, Spleen.- Pigment Deposition, Rat, Mouse.- Extramedullar Hemopoiesis, Spleen, Rat.- Amyloidosis, Spleen, Mouse.- Fibrosis, Spleen, Rat.- Thymus.- Structure and Function.- Normal Anatomy, Histology, Immunohistology, Ultrastructure, Rat.- Development and Aging, Thymus, Rat.- Neoplasms.- Lymphoblastic Lymphomas, Mouse.- Thymoma, Lymphocytic, Rat.- Thymoma, Epithelial, Rat.- T-Cell Lymphoma, Thymic Origin, Rat.- Nonneoplastic Lesions.- Atrophy of Thymus Induced by Cytostatic Chemicals, Rat.- Other Hemopoietic Tissues.- Bronchus-Associated Lymphoid Tissue, Rat, Normal Structure.- Gut-Associated Lymphoid Tissue, Rodent, Normal Structure and Function.- Intraepithelial Leukocytes, Murine.