42 MICROSCOPY FOR BEGINNERS. 



of such drawings will be as interesting and valuable as 

 the note-book. In talking to friends about microscopic 

 matters, a single rough drawing will do more to help 

 them understand than many words. And if you can 

 look at the object and make the sketch, you will like it 

 better and do yourself more good than if you bought 

 and used the drawing apparatus called a camera lucida, 

 for sale by the dealers. This camera lucida is a glass 

 prism, so arranged that when it is put over the eye-piece, 

 and the microscope is placed in a horizontal or inclined 

 position, the magnified image seems to be reflected down 

 on a sheet of paper spread on the table just under the 

 camera, but of course with a space of several inches be- 

 tween them. By placing the eye in the proper position, 

 and looking down towards the table through the edge of 

 the prism, the image and the pencil-point can both be 

 seen at once and the outlines traced. It is a rather ex- 

 pensive apparatus, and difficult to use without a good 

 deal of practice, but if you want a 

 simple arrangement that you can 

 make, try the one shown in Fig. 5. 



From a piece of thin sheet brass 

 or tin, cut with scissors a strip half 

 an inch wide and long enough for 

 B. Reaector for one end to pass around the upper 



Drawing the Magni- . 



fled object. part oi the eye-piece, and the other 



to be bent into a handle like a small 



hollow square. Cut another strip about one inch long 



and one-fourth wide, and double it lengthwise so that it 



