Petrified moss or Indian arrow-heads, for specimens of lava or fossilized fern. A flint arrow-head, for one of obsidian. A stone from Ohio, for pipestone from Dakota, or for a stone from any other State. Please write before exchanging; and if not answered, correspondents may know the stock for exchange is exhausted. EUGENE FLETCHER, P. O. Box 252, Bryan, Williams Co., Ohio. * * * * * An ounce of soil from New Jersey, for the same from any other State. L. D. COHEE, 204 Broad St., Trenton, N. J. * * * * * A perfect specimen of a cecropia moth, for a perfect specimen of a luna or a death's-head moth. WILLIAM HILL, New Brunswick, N. J. * * * * * Spear-heads and other Indian curiosities, for South American stamps and Southern and Western postmarks. C. S. GOODWIN, P. O. Box 748, Mankato, Minn. * * * * * A pair of new roller skates, for either a French five-franc piece, an English crown, or a Mexican dollar. F. G., care of Dr. A. Flint, 418 Fifth Avenue, New York City. * * * * * Pressed flowers, ferns, and leaves, flower seeds, Indian arrow-heads, pine burrs, China berries, soil, pebbles, white clay, and many other curiosities from South Carolina, for stamps and curiosities. JOSEPH W. HAWKINS, P. O. Box 9, Prosperity, S. C. * * * * * Soil and a stone from Connecticut, for the same from any other State. SUSIE D. HUNTINGTON, Care of Mrs. J. M. Huntington, P. O. Box 256, Norwich, Conn. * * * * * A Chinese coin, for some genuine Indian beads. F. STORRS HANSELL, Owego, Tioga Co., N. Y. * * * * * A collection of three hundred and forty different stamps in one of Scott's albums, for books in good condition. The stamps are mounted on adhesive paper, and can be taken out, if desired, without injury to stamps or album. Please send names of books and author before sending package. DANIEL F. HICKEY, 93 Leverett St., Boston, Mass. [_For other exchanges, see third page of cover._] * * * * *