1893.] MICROSCOPICAL JOURNAL. 217 



round or square. Cut a piece as shown in Fig. 20. Make a mortice 

 at one end, fit and glue the mortice into the hole as in Fig. 21, the 

 slit being lengthwise of the base. Make a piece like that shown 

 in Fig. 18. Fasten the lower end into Fig. 20 with a screw. If 

 made accurately, it will be firm yet move as a hinge when desired. 

 Tighten it with the screw. Make a piece like that illustrated 

 in figures 15 and 16. The tenon A is to fit in the slit B of Fig. 18 

 as before described. With a screw fasten A to B. Make a piece 

 as per Fig. 17. The holes, c, and d, are for a set-screw with which 

 to tighten. The grooves, e, and/, are for the handle of the glass. 

 Fig. 19 will give a fair idea of the completed ai)paratus. The 

 joint gives plenty of motion and the glass can b-j placed at any 

 angle. With these motions and by moving the base about, 

 the light can be brought where most desired. 



14.— EYE-PROTECTOR.— FIGURE 22. 



Do not shut the eye which you do not use in making observa- 

 tions with monocular microscope, neither squint nor press it with 

 your fingers. By continually doing so, one will be very likely 

 to injure the eye, as I know by experience. It produces astig- 

 matism. A word from one who has had a sad experience should 

 be sufficient. Buy or make a protector for the purpose and 

 save your eyes (E'ig. 22). 



Take a piece of card board, 5x7 inches. Shape it as in Figure 

 22. Cut a hole in the center near the lower edge, the size of 

 your eye-piece. Make notches in the lower edge to fit the nose. 

 If the card is not of sufficient stiffness, insert knitting needles at 

 the points shown in the illustration. Make two places for the 

 nose. You may want to use both eyes. Place this card on the 

 eye-piece before inserting it in the microscope, keeping both eyes 

 open. 



There are a great many other things that one can make with 

 pleasure and with profit in these hard times, to use while 

 waiting for better apparatus. 



15.— ADVICE FOR BEGINNERS. 



When through with the microscope, always put it in its case 

 and the objectives in their boxes. If dust gets upon it, remove 

 it with a camel's hair brush, and afterwards wipe with a chamois 

 skin lengthwise of the grain of the finish. Use no alcohol nor 

 chloroform on the lacquered parts. If any part needs oiling, 



