Animal Life and Intelligence

by C. Lloyd Morgan

• Xiphocera, [179]

Y

• Youatt "On Sheep," [455]
• Young, Thomas, his colour-vision theory, [277]
• Yung, his experiments on tadpoles, [59]

Z

• Zebra, inconspicuousness of, in dusk, [84]
• Zuyder Zee, new variety of herrings in, [99]

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