_Patient Must Inform Physician Fully Concerning his Case—His Communications Privileged._—On the other hand, as we have already stated, the patient owes the duty to his physician of informing him fully of all the varied symptoms of his disease, or the circumstances attending his injury, and to freely and with due confidence answer all questions concerning his past history which would tend to throw any light upon his present condition. To battle with the occult forces which play so important a part in determining the course or consequences of disease, it is absolutely essential that the physician should know all that is possible to be known of the patient’s history, and of the history of the patient’s family. As we shall see later on, all such communications are, in most of the States of the Union and elsewhere, by statutory enactment made privileged, and without the consent of the patient the physician or surgeon is absolutely forbidden to divulge any communication or information which he receives in order to enable him to prescribe. This rule applies equally whether the physician or surgeon is acting for hire or is treating the person as a charity patient, and it has been extended by construction by the courts in some States, so as to include examinations made by jail physicians or other physicians sent by the prosecuting officials of the State to examine a prisoner, for purpose of giving evidence, but who allowed the prisoner to suppose that they were there simply to treat him in their professional capacity. People _v._ Murphy, 101 N. Y., 126. At the same time the courts have been careful to make an exception in the case of advice given for the purpose of enabling the person receiving the advice to commit a crime, and of any information received by the physicians while the persons asking for it were engaged in a criminal attempt. All of these interesting questions will be examined and treated of at length hereafter.[166]