706 



STARCHES OP IRIDACEiE. 



Differentiation of the Starches of the Genus Iris. — Continued. 



PoLARiscopic Propebties. — Continued. 

 Degree of PolarizcUion. 



I. florentina: Fair. 



/. pallida var. speciosa: Fair to high, higher than in 



/. fiorentina. 

 I. pumila var. cyanea: High, distinctly higher than in 



/. florentina. 

 I. bismarckiana: Fair to fairly high, aUghtly higher than 



in /. florenlina. 

 I. iberica: Fairly high, more than in /. florentina. 

 I. xiphium var. Grand Tresorier: Rather high to quite 



high, distinctly higher than in /. florentina. 

 I. xiphium var. Wilhelmine: High to quite high, dis- 

 tinctly higher than in /. florentina. 

 I. xiphium var. lusitanica: Rather high to quite high, 



distinctly higher than in /. florentina. 

 I. tingilana: High to very high, decidedly higher than 



in /. florentina. 

 I. reOadata: High to very high, decidedly higher than 



in /. florentina. 

 I. hislrio: High to very high, decidedly higher than in 



/. florentina. 

 I. alata: High to very high, decidedly higher than in 



/. florentina. 

 I. caucasica: High to very high, decidedly higher than 



in /. florentina. 



Polarization with Selenite — Quadrants and Colors. 



I. florentina: Quadrants fairly well defined, generally 



irregular, unequal in size. Colors generally pure. 

 /. pallida var. speciosa: Quadrants essentially the same 



as in /. florentina, but not quite so irregular or 



unequal. Colors more often pure than in /. 



florentina. 

 I. pumila var. cyanea: Quadrants essentially the same 



as in I. florentina, except more irregularity. Colors 



generally pure. 

 /. bismarckiana: Quadrants and colors essentially the 



same as in /. florentina. 

 I. iberica: Quadrants and colors essentially the same as 



in /. florentina. 

 I. xiphium var. Grand Tresorier: Quadrants and colors 



essentially the same as in /. florentina. 

 I. xiphium var. Wilhelmine: Quadrants and colors 



essentially the same as in /. florentina. 

 I. xiphium var. lusitanica: Quadrants and colors essentially 



the same as in /. florentina. 

 I, tinffitana: Quadrants and colors essentially the same 



as in /. florentina. 

 I. reticidala: Quadrants and colors essentially the same 



as in /. florentina. 

 I. hittrio: Quadrants and colors essentially the same as 



in /. florentina. 

 I. alata: Quadrants and colors essentially the same as in 



I . florentina. 

 I. caucasica: Quadrants and colors essentially the same 



as in /. florentina. 



Iodine Reactions. 



Intensity and Color. 



I. florentina: Fairly deep; violet. 



/. pallida var. speciosa: Fairly deep, less than in /. 



florentina; violet. 

 /. pumila var. cyanea: Fairly deep, the same as in /. 



florentina; violet. 

 /. bismarckiana: Fairly deep, the same as in I. florentina; 



violet. 

 /. iberica: Fairly deep, less than in /. florentina; violet. 

 /. xiphium var. Grand Tresorier: Fairly deep, slightly 



more than in /. florenlirM; blue-violet. 

 /. xiphium var. Wilhelmine: Fairly deep, more than in 



/. florentina; blue- violet. 



Iodine Reactions. — Continued. 



Intensity and Color. — Continued. 



/. xiphium var. lusitanica: Fairly deep, the same as in 



/. florentina; blue-violet. 

 /. tinffitana: Fairly deep, the same as in /. florentina; 



violet-blue. 

 /. reticulata: Deep, more than in I. florentina; violet-blue. 

 /. histrio: Fairly deep, slightly more than in /. florerUina; 



violet-blue. 

 /. alata: Deep, more than in /. florentina; indigo-blue. 

 /. caucasica: Deep, more than in /. florentina; indigo- 

 blue. 



Staining Reactions. 

 With Gentian Violet. 

 I. florentina: Light. 



/. pallida var. speciosa: Light, less than in /. florentina. 

 I. pumila var. cyanea: Light, the same as in /. florentina. 

 I. bismarckiana: Light, the same as in /. florentina. 

 I. iberica: Light, shghtly more than in /. florentina. 

 I. xiphium var. Grand Tresorier: Light, more than in 



/. florentina. 

 I. xiphium var. Wilhelmine: Light, more than in 7. 



florentina. 

 I. xiphium var. lusitanica: Light, more than in I. 



florentina. 

 I. tingitana: Light, slightly more than in I. florentina. 

 I. reticulata: Fair, more than in I. florentina. 

 I. histrio: Light, more than in I. florentina. 

 I. alata: Fair, distinctly more than in I. florentina. 

 I. caucasica: Fair, distinctly more than in /. florentina. 



With Safranin. 

 I. florentina: Light. 



/. pallida var. speciosa: Light, less than in /. florentina. 

 I. pumila var. cyanea: Light, the same as in 7. florentina. 

 I. bismarckiana: Light, the same as in 7. florentina. 

 I. iberica: Light, but slightly more than in 7. florentina. 

 I. xiphium var. Grand Tresorier: Fair, distinctly more 



than in 7. florentina. 

 I. xiphium var. Wilhelmine: Fair, distinctly more than 



in 7. florentina. 

 I. xiphium var. lusitanica: Fair, distinctly more than in 



7. florentina. 

 I. tingitana: Light, more than in 7. florentina. 

 I. reticulata: Fair, distinctly more than in 7. florentina. 

 I. histrio: Light, slightly more than in 7. florentina. 

 I. alata: Fair, distinctly more than in 7. florentina. 

 I. caucasica: Fair, distinctly more than in 7. florentina. 



Temperature op Gelatinization. 

 7. florentina: 71 to 72° C, mean 71.5°. 

 I. pallida var. speciosa: 74 to 75° C, mean 74.5°. 

 7. pumila var. cyanea: 72.5 to 74° C, mean 73.25°. 

 7. bismarckiana: 71 to 73° C, mean 72°. 

 7. iberica: 72.2 to 74° C, mean 73.1°. 

 7. xiphium var. Grand Tresorier: 65 to 66° C, mean 65.5°. 

 7. xiphium var. Wilhelmine: 66 to 67° C, mean 66.5°. 

 7. xiphium var. lusitanica: 66.5 to 67.5° C, mean 67°. 

 7. tingitana: 65 to 66° C, mean 65.5°. 

 7. reticulata: 64.5 to 66° C., mean 65.25°. 

 7. histrio: 65 to 66° C, mean 65.6°. 

 I. alata: 66 to 67° C, mean 66.5°. 

 7. caucasica: 64 to 65° C, mean 64.5°. 



Effects of Various Reagents. 



Reaction ivith Chloral Hydrate-Iodine. 



I. florentina: Begins in all in 30 seconds; complete in 



all in 5 minutes. 

 7. pallida var. speciosa: Begins in a few in 30 seconds; 



complete in practically all in 15 minutes. 

 7. pumila var. cyanea: Begins in a few in 30 seconds; 



complete in practically all in 15 minutes. 

 /. bismarckiana: Begins in a few in 30 seconds; complete 



in all in 5 minutes. 



