MICROSCOPES. 227 



objects : G, is the meniscus glass for fluids or transparent 

 objects : H, is a box for containing aniraalculae or any small 

 living objects, which also fits the stage : i, is a glass tube 

 to enclose a small tadpole, water newt, <kc. : j, is a slip of 

 glass for the crystallization of salts : K L M N, are small in- 

 struments used in dissection, and for turning or moving 

 objects on the stage, &c. This microscope is well adapted 

 for the botanist, mineralogist, and naturalist ; and is the 

 most useful instrument for the many purposes to which a 

 microscope can be applied. Price, $9.50. 



Description of the Improved Compound and Single Pocket 

 Microscope. (Fig. 750, next page.) A, B, c, represents the 

 body of the microscope. A middle and a double eye-glass 

 are contained in a short tube, which slides into the part A, and 

 which may be occasionally drawn out a little way, to increase 

 the magnifying power : s, the stage for laying the object on ; 

 it is moved up and down the pillar, N, by turning the nut, 

 M. By this means the object is brought exactly into the 

 focus of the magnifier at c : R, is another of the magnifiers : 

 E, is a concave mirror for reflecting light through any trans- 

 parent objects on the stage : T, is a brass box containing a 

 concave and a flat glass, between which any small living 

 insect may be confined : K, is a pair of forceps for holding 

 any object ; they are opened by pressing the small studs 

 between the thumb and finger : L, is a small ivory cylinder 

 or brass filled with cork ; it serves as a handle to turn the 

 forceps about, and also to stick any insects on, which may 

 be fixed on pins ; the pin fits into the small hole in the stage : 

 o, is a pair of tongs, for taking up any small object : P, a 

 needle fixed in a wood handle, used for turning about any 

 object on the stage while under examination : F, is a slider, 

 containing objects, three of which are sent with the micro- 

 scope : H, is a concave glass for holding fluids, it is fitted to 

 the stage ; a flat glass fitted to the stage for laying any 

 transparent objects on, is also sent in the box : i, is an ivory 

 plate, one side black and the other white, for laying opaque 

 objects on, likewise fitted to the stage : G, is a slip of glass 

 used in examining animalculae, and the crystallization of salts. 

 To use the Microscope in its Compound State. When 

 taken out of the box, screw the pillar into the top of the 

 box, the body, A, B, c, into the magnifier you intend to use, 



