ILLUSTRATIONS 



Red-breasted Nuthatch 



Chickadee 



Golden-crowned Kinglet 



The American Robin 



The Tjader Expedition Crossing the Athi Riv 



Ancient Lake-Bed at Florissant, Colo. 



Stump of Fossil Sequoia. 



Blackfoot Indian Cooking in a Paunch . 



Fasting-Place of Blackfeet . 



Scene near Tucson, Arizona . 



Study for Golden Eagle Group 



The First Zebras of the Tjader Expedition 



Group of Bahama Sponges 



Diagram of Canal System in Sponges 



Branching Sponges .... 



Section through Sponge Wall 



A Sycon Sponge 



Bahaman Sponge 



Non-Commercial Sponges 



Bahaman Commercial Sponge 



Sponge Spicules 



A Dictyonid Sponge 



Fresh Water Sponge 



Neptune's Goblets 



A Glass Rope Sponge 



A "Glass" Sponge . 



Typical "Glass" Sponges 



Vase-like Monaxonid Sponge 



The Stolon-Bearing Sponge 



Trumpet Sponge 



The Zimocca Sponge 



American Commercial Sponges 



Syrian Silk Sponge. 



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