FLUORESCENCE SPECTRA OF PLANTS 



807 



living cells are listed in Table 24.1. The two different figures given in the 

 table for the leaves of Pelargonium illustrate the statement made on page 

 744 that the position of the band ''axis" depends on the sensitivity curve of 

 the photographic plate. 



Table 24.1 

 Fluorescence Bands of Chlorophyll in Plants 



« Ilford Panchromatic Plate. '" Agfa Infrared 730 plate. " Probably chlorophyll 

 (a + d). Other peaks at 575 ni/i (phycoerythriii) and 655 niyu (phycocyanin). '' Other 

 peaks at 725 mn (chlorophyll d?) and 660 m^u (phycoc>anin). 



Figure 24.1 shows the fluorescence spectrum of a Pelargonium leaf (No. 

 7 on panchromatic plate, and Nos. 2 and 3 on Agfa Infrared 730 plate), 

 compared with the absorption spectrum of the same leaf (No. 6) and with 

 the fluorescence spectrum of chlorophyll in ether (No. 4). We note the 



