For more than a generation prison reformers have urged the extension of the pure indeterminate sentence to this class of offenders also. Their logic is sound; it is the facts that are against them. The argument runs like this: The offender should be kept in confinement only until he is fitted by his prison experience to lead an honest and useful life; when this end is attained he should be released. The answer is that the prison doesn’t in fact reform the wrong-doer; that good behavior under the conditions of prison life is no assurance of the intention or capacity of the prisoner to lead an honest and useful life after his release, and that the inspectors or other paroling authority have no other guide to go by in determining the inmates’ fitness for a life of freedom than his prison record. If the reformer makes the obvious retort--“then reform your prison so that it shall reform its inmates, and reform your paroling authority so that it shall make its determination on all the facts of the inmate’s personal history including a study of his mental conditions, his heredity and the social influences that have shaped his character,” he is admitting that we are not yet ready for the complete acceptance of the indeterminate sentence in all classes of cases. But there is a middle ground between the position of the extreme reformer and that which has been assumed by the courts of this Commonwealth. If there is to be anything short of a fixed sentence, declared by law, it should be a reasonable minimum which should also be declared by law. The policy of the indeterminate sentence is that the delinquent shall be supervised and guided and his capacity to lead an honest and useful life tested by actual experience under normal conditions of living for a period of years long enough to try out his capacity to readjust himself to a life of freedom in society. For this reason an adequate interval between the expiration of his minimum sentence, when he becomes eligible to parole, and the expiration of his maximum sentence, when he becomes free from judicial control, should be guaranteed by law.