Potato flour

Definition and stakes

Various,  Book of American Baking

“ Potato flour is a yeast food. It contains gelatinized starch, sugar, dextim amides and mineral matter, all of the bodies are yeast nutrients, the first-named being converted into sugar by a ferment in the yeast. The analysis of pure imported potato flour should approximately show as follows: Water, 10.69 per cent.; protein, 6.59 per cent; fat, 0.23 per cent; nutritious extractive matter, 78.73 per cent; fibre, 1.18 per cent; ash, 2.58 per cent, making in all a total of 100 per cent.
The extractive matter is mostly carbo-hydrates (sugar) . The ash, the mineral matter, mostly phosphates.
”
Source: Gutenberg

Carlotta C. Greer,  School and Home Cooking

“ Potato bread is moist; it keeps better than bread made entirely with wheat. It has been observed that bread containing potatoes or potato water rises quickly. It is possible that the growth of the yeast is stimulated by potato. Although bread containing potatoes is light, it is not as delicate or "fluffy" as plain wheat bread.
Since potatoes contain much moisture, the quantity of liquid used in making potato bread should be lessened. Because bread dough containing potatoes softens as it rises, sufficient flour should be added to make it very stiff or more flour added while kneading.
”
Source: Gutenberg

Portrait of Mrs. H. W. Beecher Mrs. H. W. Beecher,  Motherly talks with young housekeepers (1873)

“ The potato can be satisfactorily used in more ways than any other edible root,—in bread, pastry, starch, puddings, pies, and salad; boiled, baked, roasted, stewed, fried. It is said “they furnish flour without a mill, and bread without an oven.”
After potatoes are taken from the ground, and have been exposed to the sun and air long enough to dry, the sooner they are placed in a cool, dry cellar the better they will keep.
”
Source: Gutenberg

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