282 SYSTEMS OF TREATING STAMMERING Tlie following is the promise of a German, stutter- doctor that sells his victims an expensive book on the " cure " of stammering: "After you have written me your opinion of my book I will send you some information and practical advice that will greatly hasten the removal of your impediment." The promise is made in a circular letter sent to purchasers of the book shortly after the work has come into their possession. The circular directly suggests that the correspondents mention what progress they have made and state the fact if they have accom- plished a cure. An American author of a trashy and expensive book pays cold cash for testimonials: "Whenever you can write me thus: 'Your book is the thing I needed. I can apply its simple, natural principle, and it is a home cure in deed and in truth to me/ you can get $5,00 as a promised premium." The author supplies the very words and pays his correspondent five dollars to copy them. The same gentleman pays "tendollars in gold'7 for testimonials of cure. These facts may account for some of the ambiguous testimonials that are published. Perhaps few stam- merers are tempted by offers of money "in gold,77 but no doubt many would be seduced by promises of help in matters pertaining to their impediment.