Ink i/fc 

 THE Ml I> I IMl, PROTOPTI 



It can breathe oxygen dissolved in water by its gills; it can 

 t | t breathe dry air *>X means of iu swim-bladder, which has be- 

 come a lung. It U a dotMt-brtatktr. showing evolution in 

 POT seven months of the year, the dry season, it can 

 i inert in the mud. getting air through an open pipe to the 

 surface. When water fills the pools it can use its gills again. 

 Mod-nests or mud encasements with the lung-fish inside have 

 often been brought to Britain and the fish when liberated were 

 quite lively. 



THE ARCILEOPTERYX 



(After William Leche of Stockholm.) 



A good restoration of the oldest known bird, Archaeopteryj 

 (Jurassic Era). It was about the size of a crow; it had teeth 01 

 both jaws; it had claws on the thumb and two fingers; and i 

 had a long lizard-like tail. But it had feathers, proving itself i 

 true bird. 



WING OF A BIRD, Mlouivc, THE ARRANGEMENT OF THE FEATHERS 



The longest feathers or primaries (PR) are borne by the two fingers (2 and 3), and their palm-bones 

 (CMC); the second longest or secondaries are borne by the ulna bone (U) of the fore-arm; there is a 

 separate tuft (AS) on the thumb (Til/. 



