GENUS PISUM. 



411 



Differentiation of Certain Starches of the Genus Pisum. — Continued. 

 Histological Characteristics. — Continued. Iodine Reactions. — Continued. 



LamellcE — General Characlerislics and Number. 



Eugenie (green): Regular, rather coarse, lines discon- 

 tinuous on account of Assuring. 6 to 7 on parts 

 of large grains. 



Eugenie (yellow): Same as in Eugenie (green). 8 to 9 

 on parts of large grains. 



Thmnas Laxlon: Same as in Eugenie (green), but not so 

 coarse. 8 to 9 on parts of large grains. 



Electric Extra Early: Very distinct, rather coarse, regu- 

 lar and continuous, following outline of grain. 7 to 

 8 on larger grains. 



Mammoth Grey Seeded: Same as in Electric Extra Early, 

 but not so distinct. 7 to 10 on the larger grains. 



Large While Marrowfat: Same as in Electric Extra Early, 

 but not so distinct or coarse. 10 to 12 on the 

 larger grains. 



Size. 



Eugenie (green): From 10 to 44;i, commonly 28ju. 

 Eugenie (yellow): From 8 to 38^, commonly 20;u. 

 Thomas Laxlon: From 8 to 32^, commonly 24/i. 

 Electric Extra Early: From 6 to 44;u, conmionly 32;^. 

 Mammoth Grey Seeded: From 4 to 40m, commonly 29^. 

 Large While Marrowfat: From 6 to 50^, commonly 34^. 



PoLARiscopic Properties. 

 Figure. 



Eugenie (green): Not definite. 



Eugenie (yellow): Same as in Eugenie (green). 



Thomas Laxlon: Same as in Eugenie (green). 



Electric Extra Early: Centric or slightly eccentric, usually 

 distinct but not clear-cut, and of bean type. 



Mammoth Grey Seeded: Essentially the same as in Electric 

 Extra Early, but less distinct. 



Large White Marrowfat: Essentially the same as in Elec- 

 tric Extra Early, but less distinct. 



Degree of Polarization. 



Eugenie (green): Low. 



Eugenie (yellow): Low, slightly higher than in Eugenie 



(green). 

 Thomas Laxlon: Low, slightly lower than in Eugenie 



(green). 

 Electric Extra Early: Fairly high to high, much higher 



than in Eugenie (green). 

 Mammoth Grey Seeded: Low to fairly high, higher than 



in Eugenie (green). 

 Large White Marrowfat: Fair to high, much higher than 



in Eugenie (green). 



Polarization with Selenile — Quadrants and Colors. 



Eugenie (green): Quadrants not defined; poorly defined 

 spaces of same color grouped together. Colors not 

 pure. 



Eugenie (yellow): Quadrants same as in Eugenie (green). 

 Colors not pure. 



Thomas Laxton: Quadrants same as in Eugenie (green). 

 Colors not pure. 



Electric Extra Early: Quadrants usually fairly well defined, 

 irregular in shape and unequal in size. Colors usu- 

 ally pure. 



Mammoth Grey Seeded: Quadrants same as in Electric Ex- 

 tra Early. Colons usually pure. 



Large While Marrowfat: Quadrants same as in Electric 

 Extra Early. Colors usually pure. 



Iodine Reactions. 



Intensity and Color. 



Eugenie (green): Fairly light; violet. 

 Eugenie (yellow): Fairly light, same as in Eugenie (green) ; 

 violet. 



Intensity and Color. — Continued. 



Thomas Laxton: Fairly light, less than in Eugenie (green) ; 



violet. 

 Electric Extra Early: Fair, more than in Eugenie (green) ; 



violet. 

 Mammoth Grey Seeded: Fairly deep, decidedly more than 



in Eugenie (green); violet. 

 Large White Marrowfat: Fairly deep, decidedly more than 



in Eugenie (green); violet. 



Staining Reactions. 

 With Gentian Violet. 



Eugenie (green): Very light. 



Eugenie (yellow): Very light, same as in Eugenie (green). 



Thomas Laxlon: Very light, same as in Eugenie (green). 



Electric Extra Early: Light, more than in Eugenie (green). 



Mammoth Grey Seeded: Light, more than in Eugenie 

 (green). 



Large White Marrowfat: Light, slightly more than in Eu- 

 genie (green). 



With Safranin. 



Eugenie (green): Very light. 



Eugenie (yellow): Very light, same as in Eugenie (green). 



Thomas Laxton: Very light, same as in Eugenie (green). 



Electric Extra Early: Light, more than in Eugenie (green). 



Mammoth Grey Seeded: Light, slightly more than in Eu- 

 genie (green). 



Large White Marrowfat: Light, slightly more than in Eu- 

 genie (green). 



Temperathre of Gelatinization. 



Eugenie (green): 73 to 74° C, mean 73.5°. 

 Eugenie (yellow): 74 to 75° C, mean 74.5°. 

 Thomas Laxlon: 72.5 to 74° C, mean 73.25°. 

 Electric Extra Early: 09 to 71° C, mean 70°. 

 Mammoth Grey Seeded: 70 to 71° C, mean 70.5°. 

 Large While Marrowfat: 68 to 69° C, mean 68.5°. 



Effects op Various Reagents. 



Reaction with Chloral Hydrate-Iodine. 



Eugenie (green): Begins in a few at once; complete in 

 most in 2 minutes and in practically all in 5 

 minutes; bean type not gelatinized in an hour. 



Eugenie (yellow): Begins in a few at once; complete in 

 most in 2 minutes and in practically all in 5 

 minutes; bean type not gelatinized in an hour. 



Thomas Laxton: Begins in a few at once; complete in 

 most in 2 minut&s and in practically all in 5 

 minutes; bean type not gelatinized in an hour. 



Electric Extra Early: Begins in a few at once; complete 

 in two-thirds of the grains in 30 minutes; little 

 change after an hour. 



Mammoth Grey Seeded: Begins in a few at once; com- 

 plete in half of the grains in 30 minutes; with 

 little further change in an hour. 



Large White Marrowfat: Begins in a few at once; com- 

 plete in two-thirds of the grains in 30 minutes; 

 little further change in an hour. 



Reaction with Chromic Acid. 



Eugenie (green): Begins at once; complete in all in 3 

 minutes. 



Eugenie (yellow): Begins at once; complete in all in 5}4 

 minutes. 



Thomas Laxlon: Begins at once; complete in all in 5 

 minutes. 



Electric Extra Early: Begins at once; complete in prac- 

 tically all in 5)4 minutes. 



Mammoth Grey Seeded: Begins at once; complete in prac- 

 tically all in 4 minutes. 



Large White Marrowfat: Begins at once; complete in prac- 

 tically all in 5 minutes. 



