INTRODUCTION 



EACH student should be supplied with at least 

 one good scalpel, a pair of strong forceps, a pen- 

 cil, and a note-hook. It is expected that the Labo- 

 ratory will furnish for general use such necessary 

 equipments as bone-forceps, bone-saws, weighted 

 hooks, and dissecting-boards. 



Animals can be conveniently kept from day to 

 day by using ice or by injecting two per cent, 

 formalin into the principal vessels and cavities. 

 For convenience in studying the vascular system, 

 however, the blood-vessels should be injected with 

 some colored fluid. For this purpose an ordinary 

 starch injection mass, prepared according to the 

 following formula, may be used : * 



Dry starch (laundry) i vol. 



2 l / 2 per cent, aqueous solution of chloral hydrate i vol. 



95 per cent, alcohol % vol. 



( Dry color i vol. ) 



Color < Glycerine i vol. > % vol. 



{ 95 per cent, alcohol .... i vol. ) 



It will be found advisable to immediately re- 

 move the brain from such animals as are used for 

 the dissection of the viscera or muscles in order 

 that the organ may be hardened for later dissec- 

 tion. Brains hardened in a two per cent, solution 



* See Whitman's " Methods," p. 223. 



