Walter de la Mare: illustrations by Bold‏

I'm hoping you can help me learn more about the designer "Bold," who illustrated Broomsticks & Other Stories, Stuff and Nonsense, and a Constable edition of The Listeners. Obviously, google doesn't help with this search, and the Library of Congress has him (her?) listed only as Bold.

I featured some of the illustrations from Broomsticks on my book blog:
http://ajourneyroundmyskull.blogspot.com/2009/09/bold-settled-on-some-foreign-shore.html

I did not see any mention of Bold in Theresa Whistler's biography.

Thank you,
Will Schofield
(writing from Philadelphia)