""Secret Writing: Upon An Entirely New System"" is a book written by George Wadsworth in 1881. The book is a guide on how to write in a secret code using a new system that the author has developed. The system involves using a combination of letters, numbers, and symbols to create a code that is difficult to decipher without knowledge of the system. The book includes detailed instructions on how to create and use the code, as well as examples of how...