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article demanded, and have been surprised and disappointed at the variability of the cap which is sold as the small check or occlusive pessary. The relative sizes and proportions of the cap to its rim have a significance which it may be worth stating. In the accompanying diagrams A1 and A2 are drawings of

a satisfactory cap (see also Pl. 6, fig. iii), B1 and B2 are drawings of a type frequently sold, and in my opinion not only unsatisfactory on general principles, but liable to lead to those failures which have made some people distrust this most valuable method. The points to be noted in the drawings are primarily as follows: The Spring ring S and the conical portion C should be in such relative proportions towards each other as is indicated in A, and