GENUS CROCUS. 



749 



Differentiation of Certain Starches of the Genus Crocus. Continued. 



Iodine Reactions. CoDtinued. 



Intensity and Color. Continued. 



C. var. {Baron von Brunow): Fairly deep to light, less 



HiBTOLOQiCAL Characteristics. Continued. 

 Conspicuous Forms. Continued. 

 C. var {Baron von Brunow): Essentially the same as in 

 C. susianus, but the proportion of dome-shaped 

 and curvilinear grains is greater, the surface more 

 regular, and more doublets and triplets and quad- 

 ruplets of components of equal size. 



Hilum Form, Number, and Posilion. 



C. susianxis {Cloth-of-Gold): Form round or lenticular; fre- 

 quently a short transverse or obUque cleft at hilum. 

 In dome-shaped grains frequently a longitudinal 

 fissure from sides of small cavity; rounded forms 

 may be a cross or a longitudinal fissure. Occa- 

 sionally Y-shaped or thorn-Uke. Position slightly 

 eccentric or centric; may be eccentric to 0.33 of 

 longitudinal axis. 



C. versicolor {CLolh-of-SUver): The same as in C. sttsiamis 

 (Cloth-of-Gold), except the hilum is more often 

 demonstrable, and the fissures or cavities are 

 deeper. Position the same as in C. susianus (Cloth- 

 of-Gold). 



C. var. {Baron von Brunow): Essentially the same as in 

 C. versicolor (Cloth-of-Silver). Position the same 

 as in C. susianus (Cloth-of-Gold). 



LameUce General Characteristics and Number. 



C. suManus {Clolh-of-Gold): Not demonstrable. 



C. versicolor {Cloth-of-Silver): Not usually demonstrable; 

 usually rings around hilum, tend to follow outUne 

 of grain. 8 to 10 on grains of fair size. 



C. var. {Baron von Brunow): Not usually demonstrable. 



Size. 

 C. susianus {Cloth-oJ-Gold): From3 to 22m, commonly 12^. 

 C. versicolor {Cloth-of-Silver): 3 to 24m, commonly 16m. 

 C. var. {Baron von Brunow): 3 to 18m, commonly 13m. 



PoLARiscopic Properties. 



Figure. 



C. susianus {Cloth-of-Gold): Usually slightly eccentric, 



lines usually not distinct through the entire figure 



and frequently bent or bisected. Sometimes 2 or 



more figures. 

 C. versicolor {Cloth-of-Silver): Same as in C. susianus 



(Cloth-of-Gold), but more often regular and 



distinct throughout. 

 C. var. {Baron von Brunow): Same as in C. versicolor 



(Cloth-of-SUver). 



Degree of Polarization. 



C. susianus {Clolh-of-Gold): Fair to high. 



C. versicolor {Cloth-of-Silver): Fair to very high, higher on 

 the whole than in C. susianus (Cloth-of-Gold). 



C. var. {Baron von Brunow): Fair to high, higher on the 

 whole than in C. susianus (Cloth-of-Gold), but less 

 than in C. versicolor (Cloth-of-Silver). 



Polarization with Selenite Quadrants and Colors. 



C. susianus {Cloth-of-Gold): Quadrants usually not well- 

 defined, irregular in shape, and unequal in size. 

 Colors usually impure. 



C. versicolor {Cloth-of-Silver) : Quadrants the same as in C. 

 susianus (Cloth-of-Gold), except that the quad- 

 rants are clear-cut, regular, and equal in a greater 

 portion of the grains. Colors usually impure. 



C. var. {Baron von Brunow): Quadrants the same as in C. 

 versicolor (Cloth-of-Silver). Colors usually impure. 



Iodine Reactions. 

 Intensity and Color. 

 C. susianus {Cloth-of-GoU): Fairly deep; blue-violet. 

 C. versicolor {Cloth-of-Silver): Fairly deep, but deeper 

 than in C. susianxis (Cloth-of-Gold); violet with 

 reddish tint. 



deeply on the whole than in C. susianus (Cloth- 

 of-Gold); violet deep to light, redder than in C. 

 susianus (Cloth-of-Gold). 



Staining Reactions. 

 With Gentian Violet. 

 C. susianus {Cloth-of-Gold): Light. 

 C. versicolor {Cloth-of-Silver): Light, about the same as in 



C. susianus (Cloth-of-Gold). 

 C. var. {Baron von Brunow): Light to fair, on the whole 

 deeper than in C. susianus (Cloth-of-Gold). 



With Safranin. 

 C. susianus {Cloth-of-Gold): Light to fair. 

 C. versicolor {Cloth-of-Silver): Light to fair, about the 



same as in C susianus (Cloth-of-Gold). 

 C. var. {Baron von Brunow): Light to fair, on the whole 



deeper than in C. sv^ianu^ (Cloth-of-Gold). 



Temperature of Gelatinization. 

 C. susianus {Clolh-of-Gold): 09 to 71 C, mean 70. 

 C. versicolor {Cloth-of-Silver): 75 to 76 C, mean 75. 

 C. var. {Baron von Brunow): 71 to 73 C, mean 74. 



Effects of Vakiods Reagents. 

 Reaction with Chloral Hydrate-Iodine. 



C. susianus {Cloth-of-Gold): Begins immediately; com- 

 plete m practically all in 3 minutes, and in all in 

 5}^ minutes. 



C. versicolor {Cloth-of-SUver): Begins immediately; com- 

 plete in practically all in 7 minutes, and in all in 

 17 minutes. 



C. var. {Baron von Brunow): Begins immediately; com- 

 plete in practically all in 4 minutes, and in all in 

 11 minutes. 



Reaction with Chromic Add. 



C. susianus {Cloth-of-Gold): Begins immediately; com- 

 plete in practically all in 45 seconds, and in aU in 

 75 seconds. 



C. versicolor {Cloth-of-Silver): Begins unmediately; com- 

 plete in practically all in 2)4 minutes, and in all 

 in 4 minutes. 



C. var. {Baron von Brunow): Begins immediately; com- 

 plete in practically all in IJ^ minutes, and in all 

 in 2M minutes. 



Reaction with Pyrogallic Acid. 



C. susianus {Cloth-of-Gold): Begins immediately; com- 

 plete in 30 seconds. 



C. versicolor {Cloth-of-Silver): Begins immediately; com- 

 plete in atll in IH minutes. 



C. var. {Baron von Brunow): Begins immediately; com- 

 plete in 50 seconds. 



Reaction with Ferric Chloride. 



C. susianus {Cloth-of-Gold): Begins in a few in 30 

 seconds; complete in practically all in 10 minutes 

 and in all in 25 minutes. 



C. versicolor {Cloth-of-Silver): Begins in a few in 60 

 seconds; complete in nearly all in 15 minutes, and 

 in all in 45 minutes. 



C. var. {Baron von Brunow): Begins immediately; com- 

 plete in practically all in 15 minutes, and in all 

 in 18 minutes. 



Reaction with Purdy's Solution. 



C. susianus {Clolh-of-Gold): Begms immediately; com- 

 plete in practically all in 30 minutes. 



C. versicolor {Cloth-of-Silver): Begins immediately; com- 

 plete in about one-fourth in 30 minutes. 



C. var. {Baron von Brunoiu): Begins unmediately; com- 

 plete in about two-thirds in 30 minutes. 



