(1921). Now our point is
simply that this Marquis Wheat is a fine example of evolution going on.
In 1917 upwards of 250,000,000 bushels of this wheat were raised in
North America, and in 1918 upwards of 300,000,000 bushels; yet the whole
originated from a single grain planted in an experimental plot at Ottawa
by Dr. Charles E. Saunders so recently as the spring of 1903.

[Illustration: THE WALKING-FISH OR MUD-SKIPPER (PERIOPHTHALMUS), COMMON
AT THE MOUTHS OF RIVERS IN TROPICAL AFRICA, ASIA, AND NORTH-WEST
AUSTRALIA

It skips about by means of its strong pectoral fins on the mud-flats; it
jumps from stone to stone hunting small shore-animals; it climbs up the
roots of the mangrove-trees. The close-set eyes protrude greatly and are
very mobile. The tail seems to help in respiration.]

[Illustration: _Photo: "The Times."_

THE AUSTRALIAN MORE-PORK OR PODARGUS

A bird with a frog-like mouth, allied to the British Nightjar. Now in
the London Zoological Gardens.

The capacious mouth is well suited for engulfing large insects such as
locusts and mantises, which are mostly caught on the trees. During the
day the More-pork or Frog-mouth sleeps upright on a branch, and its
mottled brown plumage makes it almost invisible.]

[Illustration: PELICAN'S BILL, ADAPTED FOR CATCHING AND STORING FISHES

There is an enormous dilatable sac beneath the lower jaw.]

[Illustration: HORNBILL'S BILL, ADAPTED FOR EXCAVATING A NEST IN A TREE,
AND ALSO FOR SEIZING AND BREAKING DIVERSE FORMS OF FOOD, FROM MAMMALS TO
TORTOISES, FROM ROOTS TO FRUITS

The use of the helmet or casque is obscure.]

[Illustration: SPOONBILL'S BILL, ADAPTED FOR SIFTING THE MUD AND
CATCHING THE SMALL ANIMALS, E.G. FISHES, CRUSTACEANS, INSECT LARVAE,
WHICH LIVE THERE]

[Illustration: FALCON'S BILL, ADAPTED FOR SEIZING, KILLING, AND TEARING
SMALL MAMMALS AND BIRDS]

[Illustration: AVOCET'S BILL, ADAPTED FOR A CURIOUS SIDEWAYS SCOOPING IN
THE SHORE-POOLS AND CATCHING SMALL ANIMALS]

[Illustration: PUFFIN'S BILL, ADAPTED FOR CATCHING SMALL FISHES NEAR THE
SURFACE OF THE SEA, AND FOR HOLDING THEM WHEN CAUGHT AND CARRYING THEM
TO THE NEST

The scaly covering is moulted in the autumn.]

We must not dwell too long on this particular instance of evolution,
though it has meant much to our race. We wish, however, following
Professor Buller's _Essays on Wheat_ (1919), to explain the method by
which this good seed was discovered. From one we may learn all. The
paren