But I'll give you all the time I can spare."

"We can come to-morrow, too," said Shep. "We are going to stay
in Rallings over night."

"Good! I think I can give you quite a few pointers in that time. I
believe you all know something about photographs already."

"Yes; here are some of our snapshots," said the doctor's son, and he
brought forth the pictures the boys had taken on their various outings.

"These are not bad," pronounced the photographer after an examination.
"Some of them are very good. They indicate that you have it in you
to take some good pictures." And then he went over the prints
carefully one by one, telling them which seemed to be under exposed
and which over, and which had not been properly developed and printed.
Then he went into the question of grouping and centering and focusing,
and told them how best to time their exposures. He was interrupted
twice by girls who wanted their pictures taken, and then he told
them a great deal about the values of lights and shades, and about
suitable backgrounds. Then he brought forth an album of outdoor
views and told them to study what was written under each picture.

"There is the time of day and the day of the month," he said, "and
also the condition of the weather. These figures show the 'stop'
of the shutter, and these the length of the exposure. Have you a
timecard for exposures?"

"No; but we are going to get one," answered Shep.