Horn of rhinoceros, [123].

Horns of deer, [138].

Horse and early man, [232].
earliest, [223].
neck, [229].
story of, [220].
three-toed, [227].

Horseshoe crab, [171].

How mammals developed, [192].

Huxley at Oxford meeting, [42].

I

Ichneumon fly, [142].

Image of God, [288].

Improving the environment, [259].