250 



GEORGE B. ROTH 



the hind legs are tied has a U-shaped piece cut from it, as shown 

 in the ilhistration. The board is mounted near its center on an 

 extension shaft, which is fitted with two joints, the one at the 

 end to which the board is attached being a ball and socket joint 

 and the other an adjustable swivel joint. The shaft is screw^ed 

 into a metal base which has sufficient weight to hold the board 

 steadily when placed in any position. 



Fig. 1 



The procedure for making the injection is as follows: With the 

 board proper placed in a horizontal position, the animal is tied 

 to it securely, abdomen downward, by means of strings. While 

 the animal is being anesthetized the board is placed in a vertical 

 position and rotated on its vertical axis slightly so as to bring 



