I submitted my question under iBooks.
I opened my book using iBooks Author. I saved a version. I locked it. Under file, I selected publish. My iPad was connected. From the MacBook, I selected the iPad as the device. My book appears on my iPad but when I try to open, my iPad screen goes to the home screen and the book will not open.
Before completing the book, I often successfully previewed my work in progress. Even now I can preview each chapter successfully. I tried deleting half of the text and previewing this. It would not open on my iPad. Thanks for help.