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climb up on the approach of danger or on the obtrusion of 
strangers. He walks rather quick in the erect posture, but 
with a waddling gait, and is soon run down if, whilst pursued, 
he has no opportunity of escaping by climbing. . . . When 
he walks in the erect posture he turns the leg and foot out- 
wards, which occasions him to have a waddling gait and to 
seem bow-legged.” 
Dr. Burrough states of another Gibbon, the Horlack or 
Hooluk : 
«They walk erect ; and when placed on the floor, or in an 
open field, balance themselves very prettily, by raising their 
hands over their head and slightly bending the arm at the 
wrist and elbow, and then run tolerably fast, rocking from 
side to side; and, if urged to greater speed, they let fall their 
hands to the ground, and assist themselves forward, rather 
jumping than running, still keeping the body, however, 
nearly erect.” 
Somewhat different evidence, however, is given by Dr. 
Winslow Lewis : * 
“Their only manner of walking was on their posterior or 
inferior extremities, the others bemg raised upwards to 
preserve their equilibrium, as rope-dancers are assisted by 
long poles at fairs. Their progression was not by placing one 
foot before the other, but by simultaneously using both, asin 
jumping.” Dr. Salomon Miller also states that the Gibbons 
progress upon the ground by short series of tottering jumps, 
effected only by the hind limbs, the body being held alto- 
gether upright. 
But, Mr. Martin, (1. c. p. 418) who also speaks from direct 
observation, says of the Gibbons generally : 
«‘ Pye-eminently qualified for arboreal habits, and display- 
ing among the branches amazing activity, the Gibbons are 
not so awkward or embarrassed on a level surface as might 
be imagined. They walk erect, with a waddling or unsteady 
gait, but at a quick pace; the equilibrium of the body 
* Boston Journal of Natural History, Vol. I. 1834. 
