Abstract
In the light of the relative lethal and inhibitory properties of several known bacteriostats, including those recommended in the B.P., along with some observations on their partitioning ratios between rubber and water, the requirements for “sufficient of a suitable bacteriostatic” are discussed, and various criteria are suggested. Attention is drawn particularly to the narrowness of the margin between effective lethal concentration and minimum inhibitory concentration of many bacteriostats and to the consequent need to prevent their loss by absorption into rubber, or through any other cause. Activity against mould spores as well as against resistant vegetative bacteria is also desirable.

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