The value of such a collection as an educational power no language can over-estimate. This museum of comparative zoölogy at Cambridge, Mass., is pre-eminently the greatest monument to his memory. The plans of instruction at the museum and at Penikese were identical in methods and principles. The first object was to bring students face to face with Nature, discarding books and recitations, substituting original observation and work. “If I can succeed in teaching you to observe,” he said, “my aim will be attained. It is not my purpose to communicate knowledge to you, but to awaken into activity a faculty which is too generally dormant, that of observing accurately for yourselves. I will teach, but I will not give information. To all intents and purposes I will be ignorant before you. Do not ask questions, for I shall not answer them, but shall so lay out your work that you will find your own path without difficulty.” THE FIRST LESSON. On the first day, the island itself was assigned for a lesson. Questions were suggested to be answered on the following morning. What is the nature of the soil, and what is the geological constitution of this island? What is its position with respect to the points of the compass. Take the main building as your guide, if you have no compass, for that lies east and west. What is the meaning of the curve between the island and the peninsula connected with it? What is the meaning of the loose materials about us, and the huge boulders scattered over the surface? What relation does the island bear to the adjoining islands and to the main land? When the class had again assembled he allowed each to report what he had learned, and taught how by comparison and combination to understand its full significance. He said that an exhaustive answer to each of these questions, individually wrought out, would itself be a good summer’s work. By the observations thus made and subsequently during the summer, it was fully demonstrated that Penikese and the whole range of neighboring Elizabeth islands, twenty miles in length and two or three in width, were a part of a terminal moraine—formed by the great ice sheet which covered the continent during the glacial period as it was gradually receding toward the polar seas.