248 



KNOWLEDGE. 



July, 1013. 



Figure 260. 

 Mounting the lenses for a one-twelfth objective. 



Figure 261. 

 A view in the glass shop. 



x * l^'^ 



Figure 262. A microscope stand (H Edinburgh Student's) with its components and their individual pieces. 



Figure 263. 

 Assembling a microscope. 



Figure 264. 

 The testing-room examination. 



