INTRODUCTION 



A. Equipment 1 



Each student will require the following equipment for his laboratory 

 work: 



(1) Text-books. 



(2) Loose-leaf notebook, about 8^ X 10f inches, with white drawing 



paper. 



(3) Dissecting instruments consisting of medium-sized scalpel, small 



sharp-pointed scissors, medium sharp-pointed scissors, fine forceps, 

 two dissecting needles in holders, pipet, and ruler. 



(4) Two drawing pencils (2H and 4H) and an eraser. 



(5) Compound microscope with two eyepieces and two objectives. 



(6) Dissecting microscope with one lens. 



(7) Six glass slides. 



(8) Twelve cover glasses. 



(9) Lens paper. 



(10) Filter paper. 



(11) Piece of absorbent gauze. 



(12) Pins. 



B. The Use and Care of the Compound Microscope 



1. The compound microscope is a delicate, complicated, and expensive 

 instrument and must always be handled with great care. Each day before 

 using the microscope, see that all parts are clean. Be sure that they are 

 kept clean during the exercise and that the instrument is clean when you 

 leave. If you find the instrument dirty or in bad order, report it at once 

 to the instructor in charge of the room. Lens paper is furnished for clean- 

 ing the lenses, and it is not permissible to clean the lenses with any other 

 material. 



2. The microscope consists of the following parts, each of which should 

 be identified : 



(a) The base and upright support. 



(b) The stage, with a central opening which contains an iris 



diaphragm for regulating the amount of light. A con- 

 denser is also present on some instruments. 



1 The instructor will indicate which items in the equipment are to be supplied 

 by the student. 



241 



