One sudden trigger action produced by the violent contraction of the extensors of the hind-legs then takes place, and the animal is projected forwards, while he flexes the fore-legs more and more (Fig. 139). He has then risen above the obstacle (Fig. 140). Then while he makes the downward and forward balancing movement, and points his fore-limbs in the same direction, he flexes the hind ones (Fig. 141). Whilst the latter are further flexed, in order to pass the obstacle in their turn, the fore-limbs which are extended come into contact with the ground (Fig. 142). Finally, in the last phase of the leap, the animal, raising himself in front, after the impact of his hind-feet has taken place (Fig. 143), prepares to continue the pace at which he progressed before meeting the obstacle which he had to clear. THE END _London: Baillière, Tindall and Cox, 8, Henrietta Street, Covent Garden, W.C._ THE ARTISTIC ANATOMY OF ANIMALS [Illustration] SECTIONAL INDEX PAGE =Generalities of Comparative Anatomy= 1 OSTEOLOGY AND ARTHROLOGY =The Trunk:= _Vertebral Column_ 4 Sacrum 10 Coccygeal vertebræ 11 Direction and form of the vertebral column 11 _Thorax_ 12 Sternum 14 Ribs and costal cartilages 14 =The Anterior Limbs:= _Shoulder_ 20 Scapula 21 Clavicle 25 _Arm_ 28 Humerus 28 General view of the form of the forearm and hand 34 Forearm 38 Hand 44