Any member of the police force of the city shall be subject to dismissal for any one of the following grounds:
(a) Being found loafing in a saloon or other public house.
(b) Being found in a state of intoxication or a single act of drunkenness.
(c) Neglect of duty or misconduct in office.
(d) Violation of the lawful orders of the city manager, chief of police or some other officer having authority to command. (Code 1941, Arts. 109-11, 109-12)