Shaolin Chin Na Fa: Art Of Seizing And Grappling. Instructor'S Manual For Police Academy Of Zhejiang Province (Shanghai, 1936)
"...This technique is exclusively designed for practical  employment, not for decoration and show. Each man who needs to master an  effective system of self-defense, whoever he may be - civilian, military  man or member of police, must have this book. It is necessary to  systematically drill as shown in the photos and explained in the text. In  the course of time everything will turn out all right. When you suddenly  encounter an enemy and you have no firearms with you, you have to enter a  hand-to-hand fight. If you mastered this skill (CHIN NA), you will be able  to win.Moreover, having mastered this technique, you can sway the destiny of the  enemy. You can kill your enemy, cause unbearable pain, tear his muscles and  sinews, break his bones or make him unconscious for some time and  completely disable him to resist.Even a woman or a physically  weak man who mastered this technique can curb a strong enemy. This  technique demands deftness and skill, not brute force. It is necessary to  train oneself daily to make the body flexible and nimble, but "hardness"  must be hidden inside this "softness".This method is very artful and effective. For a long time it was not passed  (to other people) and was almost lost. Now we publish this rarity and pass  the priceless Art to our compatriots as a gift."/Liu Jin Sheng. The Police Academy of Zhejiang province. 1-st of May of  the 24-th year of the Chinese Republic (1935)/