CORRESPONDENCE.—In this department we intend to place our readers in communication with each other, and in this way we hope to secure for every one just such aid as may be required for any special work on hand. EXCHANGES.—An exchange column, like that which has been such a marked success in the _Journal of Microscopy_, will be opened in the Young Scientist. Yearly subscribers who may wish to _exchange_ tools, apparatus, books, or the products of their skill, can state what they have to offer and what they want, _without charge_. Buying and selling must, of course, be carried on in the advertising columns. ILLUSTRATIONS.—The journal will make no claims to the character of a “picture book,” but wherever engravings are needed to make the descriptions clear they will be furnished. Some of the engravings which have already appeared in our pages are as fine as anything to be found in the most expensive journals. Special Notice. As our journal is too small and too low-priced to claim the attention of news dealers, we are compelled to rely almost wholly upon subscriptions sent directly to this office. As many persons would no doubt like to examine a few numbers before becoming regular subscribers, we will send four current numbers as a trial trip for FIFTEEN CENTS. -------------- CLUBS. Where three or more subscribe together for the journal, we offer the following liberal terms: 3 copies for $1.25 5 〃 〃 2.00 7 〃 〃 2.75 10 〃 〃 3.50 Advertisements, 30 cents per line. As postal currency has nearly disappeared from circulation, we receive postage stamps of the lower denominations (ones, twos and threes) at their full value. Postal orders are, however, much safer and more convenient. To avoid delay and mistakes address all communications to “THE YOUNG SCIENTIST, Box 4875, New York,” and make all checks and orders payable to John Phin. ------------------------------------------------------------------------ =WHAT PEOPLE SAY OF US.= In a letter to the Editor, Oliver Wendell Holmes, the genial “Autocrat of the Breakfast Table,” says: “I am much pleased with the YOUNG SCIENTIST. It makes me want to be a boy again.” “It is a little publication, calculated to call out and educate all the latent ingenuity and thirst for knowledge which the youthful mind possesses, and we hope it will win its way into every household in the land.”—[Scientific Press. “We have never seen a periodical, designed for youth, which came nearer to our ideal of what such a journal should be.”—[Canadian Pharmaceutical Journal.