INTRODUCTION. 3 



earthen jars, for waste, and the students should be made 

 to keep everything clean. 



The tables for laboratory work should be low (not over 

 29 inches from the floor), and should afford each student 

 at least 6 square feet of surface. It is best that there 

 should be no varnish upon them, as this makes trouble 

 when alcohol is spilled. 



Each student should have the following instruments, etc. : 



Scalpel. Hand lens. 



Scissors. Jar of alcohol (or formol). 



Forceps. Note-book. 



Two dissect ing-needles. Pencils (hard and soft). 



Dissecting-pan. Drawing-paper. 



As the animals to be dissected are small, the instruments 

 should be of moderate size, delicacy being preferable to 

 strength. The dissecting-pans (preferably of copper) 

 should be about 6 by 12 inches, with flaring sides H inches 

 in height. The bottom should be covered to about 

 ^ inch in depth with wax, so that the specimen may be 

 pinned out during dissection. For most purposes it is 

 better if the wax be blackened by lampblack. When 

 possible the dissection should be carried on under water, 

 as this tends to float up and separate the parts. At 

 the close of each dissecting period the specimen should 

 be placed in the jar of alcohol or formol for preservation 

 until the next time. For this purpose the three-pound 

 glass butter-jars with screw-tops are good. Battery-jars 

 closed with a plate of glass may also be used. 



The pencils should be hard (6H, Faber), and the points 

 should be kept sharp with a file or emery-paper. For 

 drawings a smooth, hard-surfaced unruled paper is best, 

 Bristol-board, aside from expense, being preferable. The 



