Here is Philip Rosenbach's signature.
This signature is Rebecca Rosenbach's.
This is Miriam Rosenbach.
This is Dr. R's signature--Abraham S. Wolf Rosenbach.
Finally, M. Rosenbach, possibly Moses Rosenbach.
A quick look around the internet turns up a number of other copies of this book, including one whose signatures include Winston Churchill, Dame Nellie Melba, and Paul Robeson, among other famous names.
Apparently the book did not invent the ghost autograph form; instead, there was was an early 20th-century fad for the signatures and the book was a response. Mark Twain wrote a 1905 note to his daughter Clara about "ghost autographs" which "generally [make] something resembling a skeleton." (hat tip to Inherited Values) The Bancroft Library at U.C. Berkeley website has some additional examples of Twain's blots--one supposed depicting him in his "Oxford gown" and the other "Shouting the battle cry of freedom." An early 20th-century write-up on ghost autographs posted online as part of a very informative article on the Inherited Values website shows George Bernard Shaw's and President Taft's ghosts and suggests that the novelty of the form was a good way to get genuine autographs from celebrities otherwise tired of requests.
The ghost-autograph also seems to be connected with a wider interest in ink blots. In the mid-19th-century the German poet Justin Kerner used inkblots made on folded papers as inspiration for a series of poems. In Potential Images, Dario Gamboni explains that Kerner "notes that his blots...liberate the imagination and tells us that they did not arise voluntarily or through his own talent, but of their own accord. He sees them as "images of hades" or "of hell" representing spirits that were condemned to remain in the darkness of his ink-well until they could use it as means to make themselves visible..." His Kleksographien images and poetry (from the German for blots) were published posthumously in 1890 and can be read online. If you're intrigued, the the Tate blog also has an interesting post on the history of accidental forms (stains, inkblots, etc) as artistic inspiration.
Creating and interpreting inkblots became a popular parlor game. An 1896 American book called Gobolinks gave instructions and examples--each participant needed to create an inkblot and accompanying rhyme within a specified period of time and then they would be judged and prizes awarded. The book even suggests "For a specially invited Gobolink party the company may dress in any grotesque fashion, remembering only that both sides of their costume shall be the same, this being a feature peculiar to Gobolink attire." And yes, pyschology texts note that Hermann Rorschach was nicknamed Klex (inkblot) in high school, which may suggest an interest in the European version of the game (another option is that the term, which can also mean "painter," reflected a belief that he would follow his father into an artistic profession).
So, what do you see in these "ghosts"? It is a fascinating concept and one that would be easy to replicate today--if you feel inspired, please share your results!
Kathy Haas is the Associate Curator at the Rosenbach Museum & Library.