We believe that the technic to be described is a worth-while addition to previously advanced methods for examination of the spinal subarachnoid space. It is a modification of two means of demonstration of this space described by Bell, Wunderlich, Fett, and Pool (1) and by Malis, Newman, and Wolf (2). The first-named authors advocated the physiological upright position as an aid in the diagnosis of lumbar intervertebral disk herniations. The latter three, in January 1953, described their full-column technic in lumbar disk myelography. Our method, in use since early in 1953, permits radiographic examination of the spinal subarachnoid space with less discomfort to the patient. It reduces exposure. Effort on the part of surgeon and radiologist is diminished. The time required for this diagnostic procedure is lowered. The fluoroscopic pursuit of a small, fragmenting amount of radiopaque material up and down the spine, particularly over the dorsal kyphosis, is eliminated. The percentage of error is decreased. Finally, the degree of inversion of the body is cut down, an advantage greatly appreciated by the patient. The patient lies flexed in the lateral recumbent position. A spinal puncture is done in the lumbar region. If a disk herniation or other lesion is suspected in the lower spine, puncture should be done above or below the neurologically indicated level. Passage of the needle at the site of a lesion is much more difficult: it is frequently painful, and the contrast medium is less easily removed. If a lesion is suspected in the upper lumbar, thoracic, or cervical region, the fourth lumbar intervertebral space is usually best. Spinal fluid pressure is recorded, and the cerebrospinal fluid dynamics observed. Fluid is collected for laboratory examination if the pressure is not increased. The patient's head is now elevated slightly, and 21 c.c. of ethyl iodophenyl-undecylate (Pantopaque) is injected into the subarachnoid space. The needle is withdrawn, and the patient straightens out and lies prone. His feet are then placed in contact with the footboard, and the table is brought to the vertical. He then takes a few steps around the room, flexes and extends the spine if the surgeon thinks this is indicated, and returns to the table. The lumbosacral region is observed fluoroscopically and appropriate positions are selected for filming. The patient then faces the table and is returned to the horizontal. He next turns to the supine position, and by this simple maneuver complete filling of the thoracic region is accomplished. Fluoroscopy is done and films are exposed as desired. The head should be kept slightly elevated during this part of the examination to prevent cascading of the medium beyond the cervical region. The patient now returns to the prone position and is suitably supported. With his neck in extension, the table is tilted head downward.