406 Mr Gustav Mann on the 



1. Dark band: X 678 [centre = X 668] - X 656. 



2. Pale band : from X 656 - X 648. 



3. Absorption commencing at X 526. 

 Absorption ending at X 462. 



Centre of the area showing least absorption : 

 X 454-3. 



4. General absorption commencing at X 446. 



U. An extract made by triturating two young leaves with 

 petroleum ether, was to the naked eye of a pale yellow 

 colour. There were no absorption-bands in the red end of 

 the spectrum, but the blue end showed — 



1, The centre of first absorption at X 475*5. 

 Centre of least absorption at X 457"3. 



2. The second absorption commencing at X 45 5 "5. 



„ „ its centre at X 442 '5. 



In the same extract, but more diluted, the centre of the 

 second band seemed to be at X 441. 



Asplenium nidus-avis. 



A. One leaf studied in sunlight showed — 



1. Dark band from X 698 [centre = X 668] -X 655. 



2. Pale band, its centre = X 643"5. 



3. Pale absorption, its breadth equal ) ^ -ho 



to breadth of the first two bands j ~ 



4. Absorption in blue commencing at X 499*3, and 



densest at X 485. 



5. A second absorption commencing at X 445, darkest 



at X 436*5, which, after becoming slightly lighter, 

 merged into the normal absorption at the blue end 

 of the spectrum. 



B. Two leaves studied in sunlight showed : — 



1. Dark band from X 676 - X 658. 



2. Pale band from X 658-X 642. 



3. Absorption, its centre at X 618*5. 



4. Absorption, its centre at X 576. 



5. General absorption commencing at X 495. 



Therefore the absorption spectrum consists of — 



