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Updated: October 23, 2026
Yellow fever, immunity of negroes and mulattoes from. Youatt, Mr., on the development of the horns in cattle. Yura-caras, their notions of beauty. Zebra, rejection of an ass by a female; stripes of the. Zebus, humps of. Zigzags, prevalence of, as ornaments. Zincke, Mr., on European emigration to America. Zootoca vivipara, sexual difference in the colour of.