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PLATE IX 



"igure IT 148. Multiple t^apilloma of the esophagus. The small tufts of epithelial cells are cut in cross sections and 



>w a tendency to form epithelial "pearllike" structures. Magnification X 350. 



^igure 2. T 306. Thymoma. Numerous thymocytes and epithelial cells are shown embedded in an irregular framework 



reticulum tissue. Magnification X 400. 



ngure 3. T 236. Undifferentiated adenoma of the ovary. Although the tumor cells show no tendency to dilferentiate 



3 any recognizable structure, the neoplasm was confined to the ovary and, therefore, was benign. A single mitotic figure may 



noted. Magnification X 1500. » s s j^ 



'igure 4 T 1.57. Mesothelioma. Note the sheetlike arrangement of cells and compression which causes polygonal shape 



cell outline. Magnification X 600. 



