The Mental Efficiency Series Comprises Ten Titles Including: Personality, How To Build It; Common Sense, How To Exercise It; Practicality, How To Acquire It; Timidity, How To Overcome It; Poise, How To Attain It; Character, How To Strengthen It; Opportunities, How To Make The Most Of Them; Influence, How To Exert It; Speech, How To Use It Effectively; And Perseverance, How To Develop It.