May 23, 1930. July 11, 1930. Present: RUGG, C.J., CROSBY, CARROLL, WAIT, SANDERSON, JJ. Evidence, Competency; Notes refreshing recollection; Opinion: expert. Witness, Cross-examination. Practice, Civil, Exceptions: whether error harmful. Damages, In tort. At the trial of an action of tort for personal injuries, the only issue was the amount of damage suffered by the plaintiff. The plaintiff called a physician as a witness, who, during his direct testimony, for the purpose of refreshing his recollection