The object of the JOURNAL OF MICROSCOPY is to diffuse a knowledge of the best methods of using the Microscope; of all valuable improvements in the instrument and its accessories; of all new methods of microscopical investigation, and of the most recent results of microscopical research. The JOURNAL does not address itself to those who have long pursued certain special lines of research, and whose wants can be supplied only by elaborate papers, which, from their thoroughness, are entitled to be called monographs rather than mere articles. It is intended rather to meet the wants of those who use the microscope for purposes of general study, medical work, class instruction, and even amusement, and who desire, in addition to the information afforded by text-books, such a knowledge of what others are doing as can be derived only from a periodical. With this object in view, therefore, the publishers propose to make the JOURNAL so simple, practical and trustworthy, that it will prove to the advantage of every one who uses the microscope at all to take it. ILLUSTRATIONS.—The JOURNAL will be freely illustrated by engravings representing either objects of natural history or apparatus connected with the microscope. TRANSACTIONS OF SOCIETIES.—THE AMERICAN JOURNAL OF MICROSCOPY is not the organ of any Society, but it gives the proceedings of all Societies whose officers send us a report. As the JOURNAL is devoted _wholly_ to Microscopy, and is in good form and size for binding, no better medium can be had for preserving the scientific records of any society. Matters of mere business routine we are frequently obliged to omit for want of room. EXCHANGES.—An important feature of the JOURNAL is the exchange column, by means of which workers in different parts of the country are enabled, without expense, except for postage, to exchange slides and materials with each other. =TERMS.= During the first two years of its existence, the subscription to the AMERICAN JOURNAL OF MICROSCOPY was only fifty cents per year, but at the request of more than two-thirds of the subscribers, the size of the JOURNAL has been doubled, and the price raised to =ONE DOLLAR PER YEAR.= Four copies for three dollars. Those who wish to economize in the direction of periodicals, would do well to examine our clubbing list. FOREIGN SUBSCRIBERS.—The JOURNAL will be sent, postage paid, to any country in the Postal Union for $1.24, or 5 shillings sterling per year. English postage stamps, American currency or American postage stamps taken in payment. In return for a postal order or draft for £1 5s., five copies of the JOURNAL will be furnished and mailed to different addresses. Make all drafts and postal orders payable to John Phin.