Dictionary of philosophy and psychology, including many of the principal conceptions of ethics, logic, aesthetics, philosophy of religion, mental pathology, anthropology, biology, neurology, physiology, economics, political and social philosophy, philology, physical science, and education, and giving a terminology in English, French, German, and Italian,

The lives of a cell : notes of a biology watcher

What is life? : the physical aspect of the living cell ; with, Mind and matter ; & Autobiographical sketches

The fitness of the environment : an inquiry into the biological significance of the properties of matter

Classification, evolution, and the nature of biology

The waste streams of ignorance

The journey

Environmentalism vs. conservation : A look at two roads.

Ecosystem health : new goals for environmental management

Wilderness tapestry : an eclectic approach to preservation

Wisdom of the elders : honoring sacred native visions of nature

Finding home : writing on nature and culture from Orion magazine