The forester's eyes and ears are the most useful tools of his profession. He is trained in school to observe continually and accurately, to listen carefully, and to record faithfully what he sees and hears. The development of the keenness of these faculties should not stop at the end of his school course, but should continue throughout his career as a forester. As forestry practice becomes more intensive in this country, the forester's ability to observe and the information he has acquired by observing, listening, and recording may easily become determining factors in his success.