Biological Institutions 57 



of the Palisades, with their great walls painted in the back- 

 ground and the lovely Hudson flowing at their base. There 

 is the reedy border of a lake from central Oregon filled with 

 the wild fowl and their nests. Another exhibit shows a bit 

 of a Florida cypress swamp, with alligators of various ages 

 and the mother guarding the nest in which the young are 

 hatching from the eggs. Here too are shown many species 

 of snakes, and amphibians, all modeled in wax and colored 

 from living specimens. Yet another group illustrates the blue 

 shark with a school of young among the sargassum weed of the 

 Gulf Stream, while still another displays an oak tree in leaf 

 with its branches covered by hosts of the beautiful monarch 

 butterfly as it appears when migrating. 



A unique feature in the Museum's exhibit is Darwin Hall 



THE GAME OF THE ' < MEN OF THE OLD STONE AGE ' ' 

 The woolly rhinoceros, with the saiga antelope and mammoth in the 

 distance. 



Copyrighted ~by the American Museum of Natural History. 



wherein are displayed groups of invertebrate animals illus- 

 trating the evolution of this portion of the animal kingdom 

 from the Protozoa to the ascidians. Among the former are 

 models of disease producing types such as the organisms 

 causing malaria and the deadly African sleeping sickness. 

 Here too are wax and glass models of the Malaria mosquito, 

 reproducing with wonderful delicacy even such minute parts 

 as the bristles on its body. The work of man in molding the 

 form of animals to his will is illustrated by cases of pigeons 

 and other domestic animals, while the results of modern 

 research in heredity are shown among other ways in the 

 offspring of a pair of rats, and in a demonstration of the 

 inheritance of color in the four o'clock. 



In the Hall of the Age of Man is depicted by painting and 

 model the story of the "Men of the Old Stone Age" as they 

 lived in their cavern homes and hunted with implements of 



