276 THE USE OF THE MICTIORCOPE 



184. What arc Ilartridgc's cliicf contributioji.s to niicu-oscopicul 

 methods? 



185. What was Beck's important discovery with regard to glare? 



186. What discoveries were made as to dark field by Siedeiitopf, 

 Berek, and Coles, respectively? 



187. What is the best booklet on color screens? 



188. What are the niost important points to be considered in caring 

 for an immersion condenser? 



189. What are the methods for preserA'ing objectives with their 

 original powers unimpaired for years? 



190. In what ways can the Greenough l)inocnlar l)e cared for? 



191. What two great discoveries in pure science were made with the 

 achromatic microscope? 



192. What is probably the discovery of greatest practical importance 

 yet made with the achromatic microscope? 



193. What are the legitimate uses of hypotheses? 



194. Name some methods of research. 



195. Having purchased a microscope, describe how you would adjust 

 it for best vision. 



196. Describe how a 108-watt, 6-volt electric lamp could be 

 arranged for best vision. 



197. Give rules for high-power microscopy. 



198. Give rules for routine microscopy. 



199. Mention some errors with the microscope. 



200. Give remedies for some mishaps. 



