BERNARD L. STREHLER 



203 



Fig. 5. Polarographic half-waves of firefly luciferin. 



Fig. 6. Mass cracking pattern of riboflavin. The sample of riboflavin (ca. 0.2 mg) 

 was introduced into a special platinum microfurnace consisting of a platinum 

 tube with a narrow slit which was adjusted just below the ionizing beam of 

 the mass spectrograph. The sample could be heated by applying a direct 

 current to the furnace. 



