1908-9.] Negative Attempt to detect Fluorescence Absorption. 407 
T 
F 
c 
T + F-C 
T + F-C 
T 
27-86 
1-00 
28-51 
•35 
•013 
1-45 
1-00 
2 37 
•08 
•06 
•700 
1-00 
1-555 
•145 
•21 
•392 
1-00 
1-178 
•214 
•55 
•143 
1-00 
•967 
T76 
1-23 
T + F-C 
T 
increases 
as T decreases. 
This is a property claimed for 
fluorescence absorption by Nichols and Merritt. The screen S was not 
kept in the same place during the above readings. If it had been, the 
column T + F — C would have been constant. In the similar tables given 
by Nichols and Merritt, and Miss Wick, T + F — C is constant within the 
error of observation. 
This source of error was removed by replacing the “ dead black ” paper 
