Ecology

Intelligence in Plants and Animals

Facts and Arguments for Darwin

Country Rambles, and Manchester Walks and Wild Flowers

A Shepherd's Life: Impressions of the South Wiltshire Downs

In Beaver World

Nature and Man

Forest Trees of Illinois: How to Know Them

The Story of a Thousand-Year Pine

Essays Upon Heredity and Kindred Biological Problems

Arbor Day Leaves

Mammals of Northwestern South Dakota

The Solomon Islands and Their Natives

Identification of the Larger Fungi

Sphinx Vespiformis

Freckles from the Marvelous Forest

A New Subspecies of the Fruit-eating Bat, Sturnira ludovici, From Western Mexico

Be the Change You Want to See in the World

A Rough Ride to the Future

Sustainability

Shepherds of the Wild