Micro-opaque. New York : Readex Microprint, 1972. 4 cards ; 23 x 15 cm. (Landmarks of science)
I. The climate and physical aspects of the equatorial zone -- II. Equatorial vegetation -- III. Animal life in the tropical forests -- IV. Humming-birds: as illustrating the luxuriance of tropical nature -- V. The colours of animals and sexual selection -- VI. The colours of plants and the origin of the colour-sense -- VII. By-paths in the domain of biology -- VIII. The distribution of animals as indicating geographical changes