Gibson was mindful of the exhortation, “To do good and to communicate, forget not.” He could not contain himself, when he knew so many interesting things. He was a born teacher, a communicator and medium of knowledge. His studies all had a real if unconscious aim. He could not content himself with making them simply as a contribution to the field of facts, nor to the formation of theories. He wanted them to go farther and furnish information to other men. He craved an audience. He needed pupils, or at least auditors. It was not for the sake of being heard by others, or of hearing himself, either; he wanted others to know and to enjoy the great store of wonderful and fascinating things which mother Nature keeps in store for those who love her. He was a genuine missionary of science, an apostle of art, a herald of the wonders and beauties of the world. His social nature, eager for companionships, sought associates in knowledge. He loved to share what he had received. And he took others into his confidence as soon as he had unearthed a new secret of the world around us. He had the same spirit in scientific knowledge that sends men and women to preach the gospel to the ignorant and misguided. Indeed, in one of his letters, outlining the idea of his “Sharp Eyes,” he uses the word “missionary,” which he repeats in the introduction to that volume. The whole paragraph in which it occurs shows Gibson’s feeling toward those who, “having eyes, see not:” “Recognizing too the evident hunger for information concerning every-day objects in Nature, and that where one individual would write for enlightenment one hundred would wonder in silence and ten thousand would dwell in heedless ignorance, I realized that such a book might also go forth as a missionary to open the eyes of the blind, or at least to quicken a desire for fuller comprehension of the omnipresent marvel and beauty of the commonplace.” One can realize how to such a nature, with such a sense of responsibility to others, a letter like the following would appeal, written by a friend of his who had given much of her time and strength to thought and labor for the interest of working girls: