How does Laurie help the March family when they learn about Mr. March's illness

Laurie takes a letter to Aunt March.

"Where's Laurie?" she asked presently, when she had collected her thoughts and decided on the first duties to be done.

"Here, ma'am. Oh, let me do something!" cried the boy, hurrying from the next room whither he had withdrawn, feeling that their first sorrow was too sacred for even his friendly eyes to see.

"Send a telegram saying I will come at once. The next train goes early in the morning. I'll take that."

"What else? The horses are ready. I can go anywhere, do anything," he said, looking ready to fly to the ends of the earth.

"Leave a note at Aunt March's."

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Mrs. March's warning was evidently thrown away, for five minutes later Laurie tore by the window on his own fleet horse, riding as if for his life.