The only way to express end-results in such a manner as to give authoritative guidance is by quoting statistics. Thus alone can the practitioner, unless his personal experience is far wider than ordinary, verify or qualify the promises Of an enthusiastic specialist.

Published end-results have been calculated on various systems, and may be hopelessly unreliable. Sometimes, for instance, the cases are too few to warrant generalization. Very many figures are vitiated by too early reporting; patients with cancer, for example, having been followed up for a year or two only.

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