Page:Contraception; 1st ed. (IA in.ernet.dli.2015.94163).pdf/176

the locomotive powers of the spermatozoa, so that these latter, aided by the activity of the ciliated epithelium lining the cervical canal, will gain the interior of the cavity of the uterus, and thence pass onwards to the Fallopian tubes."

These observations of Кisch appear to me to add very substantial arguments in favour of the use of the cervical cap as a contraceptive whenever security from conception is seriously desired.

Further practical details about the caps themselves may be useful. On the market are small rubber caps of many shapes and forms, generally with a solid rim, some with an air-inflated rim, others with spring rims, and all in a great variety of sizes and differences in the relations between the cap-like centres and the sides of the ring-like periphery. These originated from the continental "Mensinga," or small occlusive pessary, although the shapes now most in use are not exactly identical with the "original Mensinga" as figured by Mensinga himself. A great many registered or semi-trade names have been attached to variations of the small cap, the principle of which, whatever the variety, is essentially the covering over of the mouth of the cervical canal.