72 



EXPERIMENTAL PHARMACOLOGY 



as shown in Fig. 67, but it can be done quicker and per- 

 haps better by long sharp iron tacks which are driven 

 through the feet and into the turtle board with a hammer. 



Induction. 



s Co/7. 



Fig. 67. Arrangement of apparatus for recording turtle heart tracings by the sus- 

 pension method. Note that only a small square opening is made in the plastron over 

 the heart. 



It is very important that the auiiual be fully stretched out 

 so that it cannot move reflexli/ an<l spoil tJie tracings later. 

 Next pull out laterally the fore limbs and fasten them down 

 firmly. 



