I am doing research on the Joseph Lindon Smith (1863-1950) mural that was on PHS's third Horticultural Hall built in the 1890s.
I am attaching some files which may be of help. The attached “pullout illustration” is a brochure with a rendering of the murals, although they may not be the final images. We don’t have clear photos of the murals, since the murals were placed below the eaves of the building.
A brief history of this building appeared in this blog post.
A contemporary account appeared in Harper's Weekly.
For more information on PHS history, our book Images of America: the Philadelphia Flower Show is available in our online store.