The letters we print in reply to Charles H. Williamson's proposal in Our Post-office Box No. 83, show that his idea meets with general approval. The boys and girls think they will enjoy the study of nature. The summer vacation will give a famous opportunity for using eyes and ears out-of-doors, and so we recommend that the society be organized at once. Let it be called "The Young People's Natural History Society," having its head bureau of information in Our Post-Office Box. All boys and girls over ten and under fifteen may be allowed to join it, provided only that they are readers of this paper. The number shall not be limited. For convenience' sake, we will imagine that the editor of YOUNG PEOPLE is in the chair. The chair in this case assumes what is called the appointing power. He will appoint Charles H. Williamson, Brooklyn, E. D., N. Y., who was the original mover in the matter, president of the society. Branches may be formed in any city, town, or village where there are intelligent boys and girls. No initiation fee shall be charged, and no money shall be paid for any purpose whatever. Owners of books about natural history may take them to the club meetings, which ought to be held once a fortnight, at a designated time and place. The only officers necessary to a good organization shall be a president and a secretary. It is always a good plan to have as few officers as possible in such societies as these. It shall be the duty of members to find out all they can about the special department of natural history pursued by their branch. Of course their studies must depend somewhat upon the place where they live, whether inland or by the sea, in a warm or cold climate, etc. Books are very helpful, but we advise you to try to _discover facts_ through your own observation. On the first Monday of every month the various secretaries may send reports to Our Post-office Box, telling what they have done. Please tell the name of your president in the first report you send. If difficulties arise, they will be adjusted by President Williamson; and if any questions are too perplexing for him to settle, he may refer them to the Editor, who will of course remain in the chair. * * * * * The following exchanges are offered by correspondents: A history of Montreal, two colored pictures of the city, and a picture of the American Falls, and a pantograph, with full directions for enlarging pictures, for a foot-power scroll-saw. Please write to arrange exchange. CLARENCE MARSH, 392 North La Salle St., Chicago, Ill. * * * * * Soil and stones of Ohio, for the same of any other State. KITTIE G. MATCHETTE, P. O. Box 103, Greenville, Darke Co., Ohio. * * * * * Chinese coins, for foreign and United States postage stamps. An ounce of soil from California, for the same from any other State.