Since Weigert1first described the presence of a thymoma in a case of myasthenia gravis, reports of this association have become increasingly frequent, and great interest has been aroused in its significance. We have been fortunate in observing two patients with myasthenia gravis in whom thymomas were found at necropsy. Alter and Osnato2suggested "that all cases of myasthenia gravis with definite pathologic observations should be recorded, not only for the reason of their rarity, but that they may serve toward the construction of an explanation of the pathology of the disease, confirm part of it or offer useful hints for future observation." For these reasons the following cases are reported. REPORT OF CASES Case 1—History. —K. F., a Greek housewife, aged 27, was admitted to the Lenox Hill Hospital from the ophthalmologic dispensary on Dec. 19, 1932, complaining of drooping of both eyelids. Three weeks before