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When cotton yarn is used to adulterate linen it becomes fuzzy through wear, and when used to adulterate other fabrics, it wears shabby and loses its brightness. But wherever the soil has been enriched by the decomposition of the leaves of the birch the battle begins. In these ways it has been proved that in North America there were three centers where ice gathered to the greatest depth, and from which it flowed in all directions outward. They have often only nine primary wing-feathers instead of ten as in all other pigeons. Not only is the range of variability very great, but the period is remarkably irregular.