But though we cannot, in every case, say when these signs exist, that the female must be pregnant, we can nearly always say, when they do not exist, that she cannot be so, particularly if the other usual signs are absent.
— from The Matron's Manual of Midwifery, and the Diseases of Women During Pregnancy and in Childbed Being a Familiar and Practical Treatise, More Especially Intended for the Instruction of Females Themselves, but Adapted Also for Popular Use among Students and Practitioners of Medicine by Frederick Hollick
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