The Descent of Man

individuals in an intermediate condition would
have been miserably ill-fitted for progression.
But we know (and this is well worthy of reflection)
that the anthropomorphous apes are now
actually in an intermediate condition; and no
one doubts that they are on the whole well
adapted for their conditions of life. Thus the
gorilla runs with a sidelong shambling gait, but
more commonly progresses by resting on its
bent hands. The long-armed apes occasionally
use their arms like crutches, swinging their
bodies forward between them, and some kinds
of Hylobates, without having been taught, can
walk or run upright with tolerable quickness;
yet they move awkwardly, and much less securely
than man. We see, in short, in existing
monkeys a manner of progression intermediate
between that of a quadruped and a biped; but,
as an unprejudiced judge (75. Prof. Broca, La
Constitution des Vertebres caudales; 'La Revue
d'Anthropologie,' 1872, p. 26, (separate copy).)
insists, the anthropomorphous apes approach