This is an odd book: it’s part of a small sub-set of pony books that attempted to combine a story with instruction, and I think it’s quite possibly one of the worst of them. The story is bizarre – the man you find carrying a gun in your greenhouse is of course actually a kindly Professor, and that’s just the start. The pony book the Bynner father is apparently writing is dry as dust. The one small flicker of light on the horizon is that if all of the finished work is quoted in the book, it is blessedly short. This author only wrote one pony book, as far as I’m aware.
Finding the book
This is very easy to find both with and without dustjacket.
Links and sources
Many thanks to Amanda for the picture.