The person to whom the summons is delivered for service shall note on it the day of its delivery to him, and, if required by the plaintiff, shall execute it immediately. When executed, he shall immediately return the summons with the date and manner of its execution, by mail or otherwise, to the clerk of the court issuing it. (C.C.P., s. 75; Code, s. 280; Rev., s. 713; C.S., s. 754; 1967, c. 954, s. 3.)