Edward Horowitz wrote this book in 1960. I don't know much about his credentials - he was a teacher of Hebrew in junior and senior high schools in New York. And the book can be read by such students. It therefore isn't really a research book - no sources, no index.
But he does have some interesting ideas, and most seem to make sense. It's a nice light read, and does give a good background to the development of Hebrew words in general.