826 PROFESSOR PIAZZI SMYTH ON COLOUR, 
13. LISBON PORT-WINE = Reddish Brown. 
Shows one band, from red to yellow, dully. 

Wave-number | Colour Region by 
Intensity. r. in Brit. Inch. | Wave-number. 
ight beeing | tke 22. aco ee aie 0 25°39 | 35 868 | Rep 
Maximum Licut 3 : : : : 4 25°72 40 016 | AmBER 
End ale ie : : : : : : 0 26:06 43 687 | YELLOW 


14. PORT-WINE last from LEITH. 
Shows one red band only ; but that very red. 


Light begins. : : ' : 0 25°31 34 758 | Crimson Rep 
Maximum Licut J ; f P : 3 25°59 38 462 | SCARLET 
Endy ees s : : : : ; 0 25°81 41 034 | AMBER 

15. RED MARSALA. 
Like the port, but paler. 


Lightibesins’ | .1I8 Th 7 OSek c ©: 0 25°26 34 095 | Crimson Rep 
Maximum Licut : ; j , : 4 25°70 39 777. | ORANGE 
Endall = ; : ‘ 3 : ; 0 26:09 43 975 | YELLOW 


16. LISBON COLLARES. 
Shows intense red band. 


Light begins. : ; : : ; 0 25°29 34 495 | Crimson RED 
Maximum Licut : . , : 5 3 25:54 37 879 | SCARLET 
Bad ale : . j : 2 ; | 0 25°72 40 016 | AMBER 

The above, when diluted with water, were still mono-chroic, though the band of each 
became broader, and included more or less citron and green, as well as red. 

