housefly's wing which has no such anterior enlargement
to assist (?) it in flying.

AN ABNORMAL SHAPE.--Another illustration is
shown in Fig. 30, which has a deep concave directly
behind the forward margin, as at A, so
that when the plane is at an angle of about 22
degrees, a horizontal line, as B, passing back from
the nose, touches the incurved surface of the plane
at a point about one-third of its measurement
back across the plane.

_Fig. 30. One of the Monstrosities_

This form is an exact copy of the wing of an
actual bird, but it belongs, not to the soaring,
but to the class which depends on flapping wings,
and as such it cannot be understood why it should
be used for soaring machines, as all aeroplanes
are.

The foregoing instances of construction are
cited to show how wildly the imagination will
roam when it follows wrong ideals.

THE TAIL AS A MONITOR.--The tendency of the
center of pressure to change necessitates a correctional
means, which is supplied in the tail of
the machine, just as the tail of a kite serves to
hold it at a correct angle with respect to the wind