PROGRESSION OF ANIMALS 



XI. Man, the only erect animal, compared with the 

 birds. Winged human beings an impossible invention of 

 the artists. 



XII. Differences of flexion in the limbs of man and of 

 the quadrupeds explained. 



XIII. The diff'erent modes of flexion enumerated and 

 illustrated by diagrams. 



XIV. " Diagonal " movement of the legs of quadrupeds. 

 Movement of crabs. 



XV. Birds and quadrupeds compared. The structure 

 of the legs of birds. Oblique attachment of wings and 

 fins. The structure of oviparous quadrupeds. 



XVI. Movement of bloodless animals. The peculiar 

 movement of the crab. 



XVII. Crabs, lobsters, flat-fish, and web-footed birds. 



XVIII. \^Tiy birds have feet, while fishes have not. 

 Fins and wings compared. 



XIX. The movement of testaceans. Conclusion. 



ABBREVIATIONS USED IN THE 

 APPARATUS CRITICUS 



Ζ = Codex Oxoniensis Collegii Corporis Ghristi W.A. 



2.7. 



U = Codex Vaticanus 260. 



S = Codex Laurentianus 81. 1. 



Ρ = Codex Vaticanus 1339. 



Υ = Codex Vaticanus 261. 

 Leon. = Latin translation of Nicholas Leonicus. 

 Mich. = Greek commentary of Michael Ephesius. 



Q 2 483 



