Life Sciences

Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)

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

Biology

On the Tendency of Species to Form Varieties

Fossils: A Story of the Rocks and Their Record of Prehistoric Life Denver Museum of Natural History, Popular Series No. 3

Parasites: A Treatise on the Entozoa of Man and Animals. Including Some Account of the Ectozoa

Outlines of dairy bacteriology A concise manual for the use of students in dairying

Comments on the Taxonomy

Migration of Birds

A bacteriological study of ham souring

Evolution: An Investigation and a Critique

Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico

Death and resurrection from the point of view of the cell-theory

The Social Direction of Evolution: An Outline of the Science of Eugenics

Alcoholic Fermentation Second Edition, 1914

New Species and Synonymy of American Cynipidæ

Essays Upon Heredity and Kindred Biological Problems

Explanation of Terms Used in Entomology

Mental Radio

Life's Dawn on Earth