HORMEKU v. DIRECTOR OF PRISONS Administrative law—Public officer—Appointment—Termination—Public officer has constitutional guarantee of tenure until he is 60 years old—Dismissal only for just cause shown—Procedure for showing just cause—H, a prisons officer, dismissed summarily—Non-compliance with statutory procedures—Whether dismissal valid—Prisons Service Decree, 1972 (NRCD 46), s. 19— Constitution, 1979, arts. 155 (b) and 162 (1).