"For the same reason that it breaks down the vegetable tissue. Heat expands, and the greater the heat the more rapid the expansion. When the rays of the sun, which contain a great deal of heat, fall on any part of a frost-bitten plant, that part begins to expand so rapidly and violently that the cellular tissues are ruptured, and life is destroyed. What is more, the heat does not permeate equally and at once the parts affected by frost. The part furthest away from the heat remains contracted, while the parts receiving it expand rapidly and unequally, and this becomes another cause for the breaking up of the vegetable tissue. The same principle is illustrated when we turn up the flame of a lamp suddenly. The glass next to the flame expands so rapidly that the other parts cannot keep pace, and so, as the result of unequal expansion, the chimney goes to pieces. With this principle in mind, we seek to withdraw the frost and to reapply the vivifying heat very gradually and equally to every part, so that the vegetable tissues may be preserved unbroken. This is best done by immersing them in cold water, and then keeping them at a low temperature in a shady place. As the various parts of the plant resume their functions, the light and heat essential to its life and growth can gradually be increased."
"It seems to me that your theory is at fault, Webb," said Leonard. "How is it that some plants are able to endure such violent alternations of heat and cold?"
"We don't have to go far—at least I do not—before coming to the limitations of knowledge. What it is in the structure of a plant like the pansy, for instance, which makes it so much more hardy than others that seem stronger and more vigorous, even the microscope does not reveal. Nature has plenty of secrets that she has not yet told. But of all people in the world those who obtain their livelihood from the soil should seek to learn the wherefore of everything, for such knowledge often doubles the prospect of success."
"Now, Amy," said Burtis, laughing, "you see what sort of a fellow Webb is. You cannot even sneeze without his considering the wherefore back to the remotest cause."
"Are you afraid of me, Amy?" asked Webb.
"No," was the quiet reply.
Amy spent the greater part of the day in unpacking her trunks, and in getting settled in her home-like room. It soon began to take on a familiar air. Hearts, like plants, strike root rapidly when the conditions are favorable. Johnnie was her delighted assistant much of the time, and this Christmas-day was one long thrill of excitement to the child. Her wonder grew and grew, for there was a foreign air about many of Amy's things, and, having been brought from such a long distance, they seemed to belong to another world. The severe cold continued, and only the irrepressible Burtis ventured out to any extent. When Alf's excitement over his presents began to flag, Webb helped him make two box-traps, and the boy concealed them in the copse where the rabbit-tracks were thickest. Only the biting frost kept him, in his intense eagerness, from remaining out to see the result. Webb, however, taught him patience by assuring him that watched traps never caught game.
Beyond the natural home festivities the day passed quietly, and this was also true of the entire holiday season. Cheerfulness, happiness abounded, and there was an unobtrusive effort on the part of every one to surround the orphan girl with a genial, sunny atmosphere. And yet she was ever made to feel that her sorrow was remembered and respected. She saw that Mr. Clifford's mind was often busy with the memory of his friend, that even Burt declined invitations to country merrymakings in the vicinity, and that she was saved the ordeal of meeting gay young neighbors with whom the Clifford home was a favorite resort. In brief, they had received her as a daughter of the house, and in many delicate ways proved that they regarded her as entitled to the same consideration as if she were one. Meanwhile she was shown that her presence cast no gloom over the family life, and she knew and they knew that it would be her father's wish that she should share in all the healing gladness of that life. No true friend who has passed on to the unclouded shore would wish to leave clouds and chilling shadows as a legacy, and they all felt that in Amy's case it had been her father's desire and effort to place her under conditions that would develop her young life happily and therefore healthfully. There is the widest difference in the world between cheerfulness and mirthfulness which arise from happy home life and peaceful hearts, and the levity that is at once unfeeling, inconsiderate, and a sure indication of a coarse-fibred, ill-bred nature. Amy was made to feel this, and she found little indeed which jarred with memories that were only sad, not bitter or essentially depressing. Every day brought new assurance that her father's wishes and hopes in her behalf had been fulfilled to a degree that must have added to his heavenly content, could he have known how well he had provided for her. And so the busy days glided on; and when the evening brought the household together, there were music, reading aloud, and genial family talk, which usually was largely colored by their rural calling. Therefore, on New-Year's morning Amy stood as upon a sunny eminence, and saw her path leading away amid scenes that promised usefulness, happiness, and content.