Fig. 15. Apparatus for the activation of ergosterol. The light source is an alter- 

 nating current carbon arc operating at 40 volts, 40 amperes across the terminals- 

 By the use of a constant current (floating secondary) transformer and a system of 

 relays sensitive to voltage changes, the automatic feeding of the carbons is closely 

 regulated. Equidistant from the arc four fused quartz flasks are located, each of 1 

 liter bulb capacitj'. The neck of each is greath' extended, so as to form the inner tube 

 of a reflux condenser. Refrigerated water is circulated through the insulated jacket. 

 40 g. of ergosterol and 3600 cc. of purified ether constitute a charge. CO2 is passed 

 through the solution to expel air, and immediately the open end of the condenser is 

 capped with a toy balloon. Thus in the "breathing" incident to irregular boiling, 

 the sj'stem is compelled to breathe its own breath, and ingress of air is prevented. 

 (After Bills et al}^) 



213 



