One great advantage consists of the rack and pinion adjustment for focus. It also has a condensing lens for giving a better illumination to opaque objects. The dividing _Achromatic_ object-glass gives a range of powers from 75 to 290 diameters, (not _times_, which is _area_, remember), with an improved quality of definition. Two prepared objects, two glass slips and brass forceps accompany each instrument, and the whole is packed in a neat polished mahogany case. N. B. Any one desiring this Microscope for immediate use, or as a present, can forward $12.00 and receive it, and afterwards make up a Premium Club for it, as above offered, deducting the proper amount from the $12.00. Price $12.00. Receiver to pay express charges. =THE MICROGRAPH.= Given for new subscriptions amounting to $1.50. [Illustration] The Micrograph is a microscope which can be used for viewing all small objects, such as seeds, minerals, insects, etc., and for this purpose will be found very useful. There is also furnished with each instrument a set of 100 microscopic pictures photographed on glass. This instrument is beautifully polished and nickel-plated, with sliding tube for adjusting the focus and a reversible glass reflecting mirror. The price is $1.00 postage paid. =THROUGH A MICROSCOPE.= Given for new subscriptions amounting to $2.00. By Samuel Wells, Mary Treat and Frederick LeRoy Sargent. It gives suggestions as to outfits, preparation of objects, and methods of experiment. Mr. Sargent tells how home-made microscopes may be prepared and used. Price 60 cents. =A GOOD MICROSCOPE.= Given for new subscriptions amounting to $1.00. [Illustration] No one need be without a microscope. We have made special arrangements by which we can offer a Combination Microscope (or Floroscope), 2 inches in length, for new subscriptions amounting to only $1.00. It has in addition to a powerful microscope lens, a mineral glass for examining plants, minerals, etc. It is very convenient. It can be put into a vest pocket, and yet is as serviceable as many more expensive microscopes. Price 50 cents. =Read carefully the conditions on the first page of Premium List.= =COMPOUND MICROSCOPE.= Given for new subscriptions amounting to $5.00; or, for new subscriptions amounting to $3.00 and 75 cents cash additional. [Illustration] This instrument will show satisfactorily the larger animalcules in pond water, the scales from a butterfly’s wing, etc. The stand is of polished brass, handsomely lacquered, with one eye-piece and one object-glass, magnifying, when combined, about 40 diameters or 1600 times. One prepared object, two glass slips and a pair of brass forceps, are furnished with it; the whole is packed in a neat polished walnut-wood case. Price $2.50. Postage paid. =POCKET COMPASS, NO. 378.= Given for new subscriptions amounting to $2.00. [Illustration]