The basic architectural feature of a tumor (case 1) described in a previous article in the Archives1 seemed to be the band of sebaceous mother cells and sebaceous cells (figs. 4 and 5 of that article). Besides that, cells closely related to pavement epithelial cells were present, which grew between the sebaceous cells (fig. 7 of the article mentioned). In some areas the bands were very broad, and islands of sebaceous cells appeared without definite sebaceous mother cells (seen in the right portion of figure 6 of the aforementioned article), side by side with large areas of cells of the second type (seen in the left portion of figure 6 of the article already referred to). The metastatic tumors consisted of a mixture of the two constituent elements of the original tumor (these are seen in figure 8 of the aforementioned article, which especially demonstrates the sebaceous tumor