“Ayah, is a silver-grey, not a pug for the show-ring, but with many good qualities. Her coat is silky and thick and her eyes dark and large, she has dense and defined markings, while her disposition is delightful. Judiciously mated, Ayah would be a most useful mother dog.”
In the book, "A History And Description of the Modern Dogs of Great Britain and Ireland (Non-Sporting Division). Including Toy, Pet, Fancy, And Ladies' Dogs.", by Rawdon B. Lee published in 1899 the following excerpt in his discussion of the origin of the black pug:
"The variety (black) is, at any rate, now quite a distinct one, and pretty well all well-regulated shows provide classes for black pugs, which are usually well-filled. Mrs. Fifield, of Eastleigh, Southampton, who has some excellent specimens, which originally came from the Brassey strain, says that when blacks are mated together they breed true to type and colour, although in almost every litter a perfectly-marked grey specimen appears, but Mrs. Fifield never bred a black one from grey parents."
Later in that same chapter, he refers to a "Miss Mortivals" and her breeding program for the black strain: