282 



INTRACELLULAR LUMINESCENCE 



100 

 80 



60 

 50 

 40 



30 



TT 



Molar cone. Molar cone, 



sulfanilamide 1 urethan 



^0.003 



■♦• 0.10 



■5-» 



^ 



20 - 



10 



I 8 



0.30 



2 - 



22.5''C 



0.45 



10 



15 



20 

 Time (mm) 



25 



30 



35 



Fig. II. The time course of the inhibition of luminescence in P. phosphoreum 

 at 22.5° C by sulfanilamide (broken lines) and urethan (solid lines), re- 

 spectively, in concentrations that cause initially similar diminutions of inten- 

 sity. (From Johnson, Eyring, and Polissar, 1954, courtesy of John Wiley & 

 Sons; data of Johnson et ah, 1945.) 



retarded by pressure. Data are not yet available in this regard. It has 

 been shown, however, that pressures of the order of 10,000 psi mark- 

 edly retard the precipitation of human serum globulin at 65° C in 

 the presence of small concentrations of ethyl alcohol which accelerate 

 the rate of precipitation (Johnson and Campbell, 1946). Similarly, 



