SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



6600 7000 7400 7800 8200 8600 9000 



Fig. 3. — Curve of inhibition in the 7600 A region. The ordinates are per- 

 centage departures from expected germination values following exposure to 

 promoting radiation, and are corrected for differences in the energy of the 

 applied radiation indicated as abscissae. 



4000 4200 4400 4600 4800 5000 5200 5400 



Fig. 4. — Curve of inhibition in the violet-blue-green region. The ordinates 

 are percentage departures from expected germination values following exposure 

 to promoting radiation, and are corrected for differences in the energy of the 

 applied radiation indicated as abscissae. The maximum inhibition was arbitrarily 

 taken as 100. 



