Colin was especially anxious to go to Woods Hole, the great marine station of the Bureau of Fisheries, situated on the southwestern corner of Cape Cod, and the most famous marine biological laboratory in the New World. The work of the Fisheries appealed to him a great deal more when it bore a relation to the sea, rather than to rivers and inland waters, and his application for a position on the summer force at Woods Hole had been sent to headquarters shortly after the New Year. Accordingly, just as soon as the term was over, he hurried to Washington.
Disappointment awaited him. His heart had been set on that especial feature of the work, but when he asked Dr. Crafts about it, the Deputy Commissioner shook his head.
"I have thought the matter over," he said, "and if you are equally anxious next year to go to Woods Hole you shall go. But this season I'm going to send you to the Mississippi to do some work on mussels."
"Very well, sir," Colin answered, his expression betraying his regrets, but his will determining that he would make no seeming complaint. "I wish I'd known this winter, and I would have given more attention to the mollusks."
The Deputy Commissioner, who had friends in Brown University, had heard indirectly once or twice about Colin, and smiled to himself. He was pleased by the lad's self-control, and continued:
"The mussel question is of a great deal more interest than you think. I'm not sure, of course, but there are signs of a pearl-fever, and if there is one, you'll certainly see something doing. The Mississippi and Ohio were like a Klondike in 1903!"
"What is a 'pearl-fever,' Dr. Crafts?" asked the boy.
"A silly infatuation that seems to strike the farmers of the river valleys every few years on hearing that a valuable pearl has been found in a mussel. The get-rich-quick hope is very general, and it seems so much easier to dredge mussels and open them until a fortune is found in one than it does to farm for a living. In 1903, thousands upon thousands of farms were deserted or sold for next to nothing by people who believed that within a week they could be made millionaires by the pearls they would find in Mississippi River mussels."
"But I thought pearls came from oysters!" exclaimed Colin in surprise.