Magnifying the Stereo-image.—The great service which this simple device has rendered in the reading of stereoscopic films prompts me to publish it as a technical suggestion. The magnification of the stereo-image permits the detection of very small areas of calcification, so important in the search for brain neoplasm. It also is a distinct aid in the study of the details of cranial structures, particularly those of the mastoid. The 6-inch magnifying glasses are affixed to a small wooden plate; this is set on the top of the Wheatstone mirrors, and slides with it in adjustment. Measuring the Phantom Image.—The other device consists of the use of transparent mirrors in the Wheatstone stereoscope, instead of the usual fully silvered mirrors. The transparent mirror permits the visualization of a measuring device inserted into the phantom, and, therefore, mensuration of any of the shadows.1 I discussed this and other methods used in pelvimetry in a paper entitled “On Thorns Method Outlining the Superior Strait o...