To make the foregoing table quite satisfactory, it ought to have been
shown that in the eight first birds the leg-bones have not actually
increased in weight out of due proportion with the rest of the body;
this I cannot show, from not knowing, as already remarked, the weight
of the wild Bankiva.[434] I am indeed inclined to suspect that the
leg-bones in the Dorking, No. 2 in the table, are proportionally too
heavy; but this bird was a very large one, weighing 7 lb. 2 oz., though
very thin. Its leg-bones were more than ten times as heavy as those of
the Burmese Jumper! I tried to ascertain the length both of the
leg-bones and wing-bones relatively to other parts of the body and
skeleton; but the whole organisation in these birds, which have been so
long domesticated, has become so variable, that no certain conclusions
could be reached. For instance, the legs of the above Dorking cock were
nearly three-quarters of an inch too short relatively to the length of
the sternum, and more than {273} three-quarters of an inch too long
relatively to the length of the skull, in comparison with these same
parts in _G. bankiva_.
In the following Table II. in the two first columns we see in inches
and decimals the length of the sternum, and the extreme depth of its
crest to which the pectoral muscles are attached. In the third column
we have the calculated depth of the crest, relatively to the length of
the sternum, in comparison with these same parts in _G. bankiva_.[435]
TABLE II.
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