he
color you think the sea-fans and other forms would be out of the water,
but the color that they seem to you to be when looked at through the
water."

"But I don't draw so awfully well, Mr. Collier," said Colin.

"You don't need to," was the reply, "it's the color that I want. There
isn't a tint known that you can't find in those pastels and I want it as
exact as you can get it. I'm going to do the same thing, you see, only
from the side. The light will cause a good deal of difference, and I
want to determine just how the shadows fall."

The boy had never had such crayons to work with and he was naturally a
good colorist. He became so absorbed that he was quite unaware of the
passage of time and it was with something of a surprise that he heard
the announcement of lunch. This was due to Early Bird, who, seeing that
it was after noon, had unpacked the hamper and set out a good meal. Both
artists dined heartily and Early Bird was not forgotten when the artists
returned to their drawings. But although Colin worked as hard as he
could, it was four o'clock before he felt that he had finished. The
museum expert was also still at work when the sun began to fail to give
a sufficiently direct light to pierce the water. Colin was eager to see
his companion's sketch, but this was denied him.

"No," he was told. "We're coming here to-morrow, and I want you to do
what I was doing to-day, while I do the overhead view."

"What's that for, Mr. Collier?" queried Colin, again.

"No two people see color values just alike," was the reply, "and while
of course I don't expect you to make a perfect picture, still if your
coloring and mine agree, we are nearly sure to have exactly the right
shade."

"But if they don't?"

"Then we have two color conceptions, and it is easy for a third person
to say which looks the most real to him. Early Bird, for example, could
tell which looked the best to him, although, of course, he could not
describe the color."

"Then we're coming back here to-morrow?"

"If the wind is suitable, yes."

Colin was simply aching with eagerness to see the other drawing but had
to be content with the promise that he could see it as soon as he had
done the duplicate, and not before, as he might be prejudiced thereby.
Before going home that day they dropped as a marker a heavy lead disk
about six inches across, painted white, to which was attached a buoy, so
that they could find the identical place again; and the