Note 8 — Chapter III · Symbols of Music Defined (Continued)
Reading edition
It has already been noted (p. 6, Note) that in the German scale our b-flat is called b, and our b is called H. From this difference in terminology has grown up the custom of using the H (now made ♮) to show that any staff-degree is in natural condition, i.e., not sharped or flatted.