“ The best-known tree frog is the little Hyla arborea of continental Europe, rainette of the French, Laubfrosch of the Germans, often kept in glass cylinders provided with a ladder, which the frog is supposed to ascend or descend in prevision of the weather. ”

“ Close allies of Hyla are the Nototrema of Central and South America, in which the female develops a dorsal broad pouch in which the young undergo part or the whole of their metamorphoses. The genus Phyllomedusa, also from Central and South America, are quadrumanous; the inner finger and the toe being opposable to the others, and the foot being very similar to the hand. ”