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.