xxiv INTRODUCTION. 



For injecting larger animals, such as a rabbit, with, plaster 

 of Paris, the blood must first be washed out of the vessels 

 by injecting warm salt-solution. The following apparatus is 

 necessary, and must all be placed on the table ready for use 

 before the animal is killed ; for the blood coagulates after 

 death so rapidly as to allow no time to look for instru- 

 ments. 



1. Cannulse : glass ones are the most convenient ; they 

 should be of various sizes, to fit the several vessels which it is 

 proposed to inject, and each should have a slight constriction 

 near the tip, so that it may be firmly secured in the vessel by 

 a ligature. The largest cannula that will enter the vessel 

 should be used. 



2. A glass syringe, capable of holding about an ounce of 

 fluid. A larger syringe is liable to get blocked up. 



3. Several pieces of strong india-rubber tubing, about 

 an inch long, to connect the nozzle of the syringe with the 

 cannula, both of which they must fit rather tightly. 



4. Two or three glass plugs to fit the india-rubber tubing. 



5. A dish of water or salt-solution, in which all the 

 cannula and india-rubber connections are laid, to displace 

 the air from them. 



6. Fine plaster of Paris. 



7. A mortar and pestle. 



8. Colouring matter, such as vermilion previously rubbed 

 up with water : it must be well shaken before use. 



9. A piece of muslin to strain the injection through. It 

 must be well wetted before use. 



10. A jar into which to strain the injection. 



11. A jar containing about half a pint of salt-solution 

 (75 per cent.), at a temperature of 38 to 40 C. 



12. Dissecting-board, pins, scalpels, scissors, two pairs of 

 forceps, seeker, thin string or thread, and two or three pairs 

 of bull-dogs.' These last are very short spring-forceps, the 

 spring being so arranged as to close the forceps. They are 

 convenient to stop the escape of blood or injection from any 

 vessels that may have been cut. 



The injection should be performed close to a large sink, 



