Page:Contraception; 1st ed. (IA in.ernet.dli.2015.94163).pdf/177

There is much to be said in favour of this general principle; indeed I think it is the soundest of all methods of contraception at present in use, but of the dozen or two modifications of the cap which I have seen, one only appears to me to be thoroughly reliable and satisfactory, the particular value of this depends on the relation of the size of the cap to the rim, &c. Caps with air inflated rims, and rims containing metal springs of various sorts, I do not like, and now I always give warnings against their use, both personally and through the clinic. The simple soft but firm rubber ring of the rim in the Pro Race is in every respect the best. Nevertheless, any of the dozen or two varieties of these things on the market may, in differing circumstances, suit individual cases. One of the main faults to be found in many brands is careless and hasty construction; the "seam for instance being joined so that minute perforations exist. The junction between the dome-like cap and the rim is often carelessly connected, or left very rough and difficult to keep clean. Also (an important point in the construction) the majority of the forms have what I consider too low a dome.

I have followed up various complaints of failure, or of inability to obtain exactly the