I present a condensed report of thirty cases to show the results I have obtained with this instrument I have devised, and what may be expected of it for the future. There have been no untoward results in a single case of the series. The apparatus1consists of a one-piece glass tube, with a right-angled arm for the attachment of a rubber tube leading to the manometer; a posterior beveled tip for the attachment of a 2 ounce rubber bulb ear syringe, and an anterior curved tip for insertion into the cervix, with a bulb blown into it about 1½ inches back of the tip, which plugs the cervix and prevents the escape of air during the test. Determination of the patency of the fallopian tubes by means of intra-uterine inflation is a comparatively recent operation devised and reported by Rubin.2Before Dr. Rubin made this discovery, it