JAMES W. QUEEN & CO., OPTICIANS, 924 Chestnut Street, Philadelphia, MANUFACTURERS OF MICROSCOPES, And Other Optical Instruments. BECK'S, CROUCH'S, ROSS', NACHET'S HARTNACK'S, ZENTMAYER'S AND SEND THE CATALOGUE PRICES. NOTICE. We would call special attention to of glass slips, thin glass covers, and ebonite cells. EXCELSIOR SCROLL SAW. LATEST IMPROVEMENT. Double Treadle, including 1 dozen Saws, 30 inimitable Fret Sawing Patterns and Prepared Wood, to the value of $4; a new device for tightening saw, Power Drilling attachment. Wrench, Oil Cup and Screwdriver. Speed, 800 strokes per minute. Saws 1 1-2 inch thick. LIST. the fact that we have greatly reduced the prices Send for the List. THE ALMOND CHUCK T. R. ALMOND, Is the BEST, most Elegant and All Steel. Price 5. Price, complete, cased and deliv- 84 Pearl 8t., Brooklyn, N. Y. 105 Fulton St., New York. Saw only, without Attachments, $9.00. SMALL STEAM ENGINES, with copper Boiler, to drive light Lathes Scroll Saws, etc. 100 Scroll Work Designs Free on receipt of stamp. GEORGE PARR, Buffalo, N. Y. A. K. EATON, Chemist, MANUFACTURER OF PRISMS, SPECTROSCOPES, etc. Circular furnished on application to 65 Henry Street, Brooklyn, N. Y. REDUCED PRICES. Fine Mahogany Cabinets, to hold six dozen objects, flat, with lock and key 66 to hold 2 doz., flat New Staining Fluids, per bottle Thin Glass, Glass Slips, etc., at Lowest Prices. $3.00 1.00 25 MICROSCOPES, of different makers, Address From $3.00 to $500.00. G. S. WOOLMAN, Optician, 116 Fulton Street, New York. GENUINE ENGLISH PODURAS, ONE DOLLAR PER SLIDE. BINOCULAR MICROSCOPE STAND "A" (ONE-THIRD ACTUAL SIZE). MECHANICAL CONCENTRIC ROTATING AND ADJUSTABLE STAGE, CENTERING AND ROTATING SUB-STAGE, AND IRIS DIAPHRAGM. THE NEW $20 MICROSCOPE. This is a serviceable and thoroughly well-made instrument, and is not to be confounded with those cheap microscopes which are low-priced simply because they are worthless. The foot is of cast iron, and the body inclines to any angle. The tube through which the body moves is of brass, and the body itself is also of brass, and heavily nickel-plated, so as to move with the utmost smoothness. The movement is effected by a very finely-cut rack and pinion, the milled heads being very large, so that the utmost delicacy and precision may be attained and consequently powers as high as a one-fifth can be used with good effect. It is capable of doing good service in the hands of the phys ician and the naturalist, and being very simple and easily managed, it is Just the thing for the family. The Stage is vulcanite; Mirror swings so as to give oblique light; Diaphragm underneath the stage; the Body has the "Society" screw; and the Objectives are by Gundlach-achromatic and well corrected. Three years ago Objectives of the same quality could not be bought for less than the price now asked for the whole microscope. Two Eye-Lenses. Powers, 55, 95, 130 and 225 diameters. Those who wish to get a good microscope and yet do not know just what they want, can buy this microscope with the privilege of exchanging it at full value for a better instrument, any time within one year. This Microscope has been elaborated at our suggestion by Mr. Gundlach, Price in fine Black Walnut Case, with fittings for Accessories, THE INDUSTRIAL PUBLICATION COMPANY, HOT JOURNALS ENTIRELY PREVENTED BY THE USE OF BRIDGES' PATENT LUBRICANT. English Brussels, Three-Ply and Ingrain. Elegant Stair Rods; also Stair Carpets, Carpet Lining, Velvet Rugs, Oil Cloths, Crumb Cloths, Mattings, &c., &c., very cheap, at the old place, 112 FULTON STREET, NEW YORK. Carpets carefully packed and sent to any part of the United States, C. O. D., free of Express Charges. Call or send for Explanatory Circular and Price List. J. A. BENDALL. NEW MODEL MICROSCOPES. These Microscopes, which have been perfected under the direction of some of the ablest microscopists in the United States, unite stability, firmness and compactness, with as great simplicity of construction as is compatible with the purpose for which the instruments are 'intended, and for efficiency, convenience, elegance and price, they will compare favorably with any microscope now in market. They are manufactured by the BAUSCH & LOMB OPTICAL COMPANY, under the direct superintendence of Mr. E. Gund lach, formerly of Berlin, whose name is so well known among microscopists. The prices of these instruments will be found very moderate, even when compared with the exceedingly low rates at which microscopes in general are at present selling. They range in price from $20 to $200, and all have the standard society screw. THE OBJECTIVES have received the highest praise from every microscopist of note that has examined them. A fully illustrated catalogue sent free to any address. BAUSCH & LOMB OPTICAL CO., 37 Maiden Lane, New York. NEW YORK AQUARIUM Broadways 35 ST. W.C.COUP MANAGER. SCROLL SAWS. Fancy Woods, Designs, Saw Blades, and all appurtenances for scroll sawing. Large assortment; low prices; best goods. Send stamp for new 32-page illustrated catalogue. Catalogue of flower-pot Brackets, Aquarium, etc., sent on receipt of 10 cents. G. WEBSTER PECK, Manufacturers' Agent, 110 Chambers Street, New York. YOUNG SCIENTIST, A Practical Scientific Journal for Amateurs. Describes Experiments in Chemistry, Electricity, Mechanics, Optics, etc. Tells how to make cheap but efficient Microscopes, Telescopes, Galvanic Batteries, etc., and how to use them. Gives hints and directions for working with Lathes, Fret and Scroll Saws, Carpenters' Tools, etc. Contains an account of New Discoveries. Monthly-50 cents per year. Specimens free. TRIAL TRIP-4 months, 15 cents (postage stamps). Address YOUNG SCIENTIST, P. O. Box 4875, New York. (Office 176 Broadway, New York). CONTENTS OF APRIL NUMBER. Illustrated articles are marked *. A Simple Musical Instrument..... *How to Read a Drawing..... 45 46 *Simple Lessons in the Art of Photography...... 48 Publisher's Announcement........ 50 Text-Books in Physiology, Anatomy, &c. NEW AND REVISED EDITION NOW READY. A TEXT-BOOK OF Physiology, By M. FOSTER, M.A., M.D., F.R.S. Prælector in Physiology and Fellow of Trinity College, Cambridge. Second Edition, Revised and Enlarged. 8vo, $6.50. Sheep, $7.50. "Is preeminent, not only as a remarkably successful presentation of all the more recent acquisitions in physiological science, but as a book abounding in wise suggestions as to the directions in which truth is to be sought in those fields where investigations have as yet yielded only uncertain results."-Medical and Surgical Journal. "The exhaustive manner in which the author has presented what is known on the subject of his volume will be as great an attraction to the resolute student in pursuit of truth, as the rigor with which he has abstained from meddling with what is unknown."--New York Tribune. "I recommended it to the students as the latest, and in some respects the best Physiology in the.. English Language."-PROF. BURT G. WILDER. A COURSE OF PRACTICAL INSTRUCTION IN Elementary Biology, By T. H. HUXLEY, LL.D., assisted by H. N. MARTIN, B.A., M.B. "The work is entirely practical, and should be one of the first books read by the student of natural history, and by the student of medicine who desires to rest his later physiological studies upon a sound elementary basis."-Medical Record, N. Y. "I have recommended the book to students of Harvard College as the very best working manual I know of."-PROF. WYLLIS A. SILLIMAN. AN ELEMENTARY COURSE OF Practical Physiology, By Dr. MICHAEL FOSTER, assisted by J. LANGLEY. Elements of Embryology, By Dr. MICHAEL FOSTER, and FRANCIS M. BALFOUR, B. A. AN INTRODUCTION TO THE Osteology of the Mammalia, By WILLIAM HENRY FLOWER, F.R.S., F.R.C.S., WITH NUMEROUS ILLUSTRATIONS. THE $2.50. Morphology of the Skull, By W. K. PARKER, F.R.S., Hunterian Professor, Royal College of Surgeons; and G. T. BETTANY, M.A., B.Sc. 12mo, $3.50. MACMILLAN & CO., 22 Bond Street, New York. |