'Crown of Straw'; Is 'Majesty of Man' a Series Binding?

Thanks go to Richard Minsky and John Lehner who both let me know about this Morse-designed cover for Allen Upward's Crown of Straw (Dodd Mead, 1896). It is the same cover for Alien's Majesty of Man, also Dodd Mead, 1896. So, it is probably a series binding (if two constitutes a series -- or set?) but more homework is required. Below is a photograph of Alice C. Morse's own cover for this book that she left to the Museum in 1924. Link to MMA catalog record. I admire this design so much that you may have noticed that I used it for the cover of my book on Morse, only in red. Notice how there is a problem with the green stamping on the reverse diagonal-rib bookcloth.

A clue to the fact that this may have been a series cover is that the lettering is not hand done, but stamped from type.