GENUS PISUM. 



411 



Differentiation of Certain Starches of the Genus Pisum. Continued. 

 Histological Characteristics. Continued. Iodine Reactions. Continued. 



Lamella; General Characteristics and Number. 



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

 tinuous on account of fi.ssuring. 6 to 7 on parts 

 of large grains. 



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

 on parts of large grains. 



Thomas Laxlon: Same us in Eugenie (green), but not so 

 coarse. S to 9 on parts of large grains. 



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

 lar and continuous, following outline of grain. 7 to 

 S on larger grains. 



Mammoth Grey Seeded: Same as in Electric Extra Early, 

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



Large White 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^, commonly 28m. 

 Eugenie (yelloxo): From 8 to 38^, commonly 20m. 

 Thomas Laxton: From 8 to 32m, commonly 24m. 

 Electric Extra Early: From 6 to 44m, commonly 32m. 

 Mammulh Grey Seeded: From 4 to 40m, conununly 29m. 

 Large White Marroxofat: From G to 50m, commonly 34m. 



PoLARiscopic Properties. 

 Figure. 



Eugenie (green): Not definite. 



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



Thomas Laxton: 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 Laxton: 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 ivith 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. 



Mamnwlh Grey Seeded: Quadrants same as in Electric Ex- 

 tra Early. Colors usually pure. 



Large While Marroufat: Quadrants same as in Electric 

 Extra Early. Colors usually pure. 



Iodine Reaction.'^. 



Intensity and Color. 



Eugenie (green): Fairly light; violet. 

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

 violet. 



Intensity and Color. Continued. 



Thomas Laxton: Fairly Ught, 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 Marroivfat: 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). 



Mammulh 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 (yelloiv): 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 While Marrowfat: Light, slightly more than in Eu- 

 genie (green). 



Temperature op Gelatiniz.wion. 



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

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

 Thomas Laxton: 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 White Marroivfat: 08 to 09 C, mean 08.5. 



Effects of Various Reagents. 



Reaction with Chloral Hydrate-Iodine. 



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

 most in 2 min\ites 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 minutes 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 Marroxofat: Begins in a few at once; com- 

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

 Uttle further change in an hour. 



Reaction with Chromic Acid. 



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

 minutes. 



Eugenie (xjellow): Begins at once; complete in all in b}i 

 minutes. 



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

 minutes. 



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

 tically all in 53^ minutes. 



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

 tically all in 4 minutes. 



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

 tically all in 5 minutes. 



