8 



EXERCISE II 



Text-fig. 6. 1. Simple perfusion apparatus for excised mammalian heart, an essential 

 part being the Gunn device for warming the perfusion fluid as it descends through a central 

 glass tube containing the thermometer and jacketed by a cylindrical glass condenser tube 

 through which flows water from a hot-water reservoir, the pail w ; this last is shown arranged 

 to supply two adjacent student- places, r, e', reservoirs for Kinger-Locke fluid, o, oxygen 



