202 



BIOLOGICAL EFFECTS OF RADIATION 



220 



240 



300 



320 



260 280 



WAVE LENGTH 



Fig. 34. — Upper section: Full-line curves — lethal effectiveness for staphylococcus. 

 (Gates.) Dosage: a, 50 erg/mm.^; b, 100 erg/mm.^; c, 250 erg/mm. = ; d, 500 erg/mm. ^ 

 Dash-dot curves — relative lethal effect for the alga CMorella vulgaris for different dosages. 

 (Meier.) Dotted curve e, erythemal effectiveness. (Coblentz.) Middle section: a, 

 Absorption coefficient of unirradiated ergosterol, concentration 80 mg. per liter. (Reerink 

 and van Wijk.) b. First product of irradiation. (Reerink and van Wijk.) Lower section: 

 Relative sensitivity of silver and titanium photocells. Full-line curves in corex D. Dotted 

 curves in thin corex A. 



