Page:Contraception; 1st ed. (IA in.ernet.dli.2015.94163).pdf/166

all the chief benefits of coitus are obtained and the interference with the complete normal sex act is at a minimum.

The form of cap which I advise, and the obvious advantages of which are confirmed by experience of a year and a half's use at the Birth Control Clinic^[1] is given in diagrammatic form (p. 152, see Pl. iii, fig. 6). The centre or crown portion is of thin rubber, the rim being of either solid rubber or with an inflated air rim according to circumstances. Experience so confirms me in the view that the solid all-rubber rim is the best, that I advise no other, and at the Clinic we now always use the all-rubber solid rim. The essential point of the different features of the cap is that the crown should be large, high and thin, and of very perfect manufacture and the diameter should be measured across the inner side (as is the diameter of a hat) and not from the outside of the rim. The cap of this type, which has a great variety of modifications according to different makers, &c., is based on the small occlusive or Mensinga pessary, and the best variety, improved for use at our Clinic, goes under the name of the "Pro Race."