When I wrote TRUTH OF THE STOCK TAPE in 1923, it was because there was a demand for a book of that kind. People needed the help that I could give them and the benefit of my experience and knowledge. In that book I gave the best I had and received my reward. People appreciated my efforts. They bought the book then and they are still buying it. They say it is a good book and more than worth the money. That is very gratifying to me.After the 1929 bull market culminated there was a demand for a new book to meet changed conditions under the so-called "e;New Era,"e; so I wrote WALL STREET STOCK SELECTOR in the spring of 1930. I gave freely of my knowledge and the benefit of years of experience. This book helped others to protect their principal and make profits. People who read the book pronounced it one of the best. It is still selling, and again I have been rewarded.No man can learn all there is to know about forecasting the trend of stocks in 3, 5, 10, or 20 years, but if he is a deep student and hard worker, he learns more and knowledge comes easier after years of experience. I knew more about determining the trend of stocks in 1923 than I did in 1911. Seven more years of experience gave me more knowledge and enabled me to write the WALL STREET STOCK SELECTOR in 1930 and give my readers the benefit of my increased knowledge. Now, after five more years have elapsed, my experience and practical test of new rules have enabled me to learn more of value since 1930. The 1929-1932 panic and what has followed since, gave me valuable experience and I have gained more knowledge about detecting the right stocks to buy and sell. I cannot lose if I pass this knowledge on to those who will appreciate it.