Small foci of diethylstilbestrol-induced extracellular hyaline material were visualized within the mouse uterus utilizing dark-field and fluorescence microscopy following conventional hematoxylin and eosin staining. Hyaline was observed throughout the connective tissue stroma as well as between smooth muscle cells of the myometrium. The use of these techniques permits the rapid examination of small aggregates of hyaline material which are not visible with conventional hematoxylin and eosin staining and eliminates the need for time-consuming and complicated histochemical techniques. The procedures are simple and may also facilitate the quantitative (morphometric) analysis of this material.