4.-(1) The Court shall appoint any medical practitioner whom it shall think fit to examine the suspected person.
(2) The Court may, if it so thinks fit, at anytime cancel an appointment which it has made and make another in its place. But where another appointment is made the summons to the suspected person shall, if necessary, be amended accordingly; or, where service thereof has already been effected, notice of the new appointment shall, subject to the provision of rule 17, be [*431] served on the suspected person. Likewise, notice that his appointment has been cancelled shall be served on the medical practitioner concerned if, in accordance with the provisions of rule 5 (1) he has already been served with notice of his appointment. (Form 5.)