GENUS ZEA. 



355 



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



PoLARiscopic Properties. — Continued. 

 Polarizalion with Selenile — Quadrants and Colors. — Cont'd. 



Z. maij4 var. indenlata: 



Early Learning. Quadrants essentially the same as 



in Golden Queen. Colors usually pure. 

 Hickory King. Quadrants essentially the same as in 



Golden Queen. Colors not so pure as in Early 



Leaming. 

 Z. mays var. saccharata: 



Stowell's Evergreen. Quadrants essentially the same 



as in Golden Queen. Colors quite pure. 

 Black Mexican. Quadrants not well defined, usually 



irregular in shape and unequal in size. Colors less 



pure than Golden Queen and Stowell's Evergreen. 

 Golden Bantam. Quadrants not well defined, usually 



irregular in shape, and unequal in size. Colors 



purer than Golden Queen and Stowell's Evergreen. 



Iodine Reactions. 



Intensity and Color. 



Z. mays var. everta: 



Golden Queen. Fairly deep, violet. 

 White Rice. Same as in Golden Queen, violet. 

 Z. mays var. indurata: 



North Dakota. Fairly deep, more than in Golden 



Queen, about the same as Stowell's Evergreen, 



violet. 

 Compton's Early. Fairly deep, more than in Golden 



Queen and the same as in North Dakota, violet. 

 Z. mays var. indentala: 



Early Leaming. Fairly deep, more than in Golden 



Queen, violet. 

 Hickory King. Fairly deep, more than in Golden 



Queen and Early Leaming, violet. 

 Z. mays var. saccharata: 



Stowell's Evergreen. Fairly deep, slightly more than 



in Golden Queen, violet. 

 Black Mexican. Fairly deep, slightly more than in 



Golden Queen, violet. 

 Golden Bantam. Fairly deep, slightly more than in 



Golden Queen, violet. 



Staining Reactions. 



With Gentian Violet. 



Z. mays var. everta: 



Golden Queen. Light. 



White Rice. Light, less than in Golden Queen. 

 Z. mays var. indurata: 



North Dakota. Light, same as in Golden Queen. 

 Compton's Early. Light, same as in Golden Queen 

 and North Dakota. 

 Z. mays var. indenlata: 



Early Leaming. Light, same as in Golden Queen. 

 Hickory King. Light, same as in Golden Queen and 

 Early Leaming. 

 Z. mays var. saccharata: 



Stowell's Evergreen. Very light, less than in Golden 



Queen. 

 Black Mexican. Very light, less than in Golden 



(^ueen and Stowell's Evergreen. 

 Golden Bantam. Very light, less than in Golden 

 Queen and Stowell's Evergreen. 



With Safranin. 

 Z. mays var. everta: 



Golden Queen. Very light. 



White Rice. Very light, slightly less than in Golden 

 Queen. 

 Z. mays var. indurata: 



North Dakota. Light, more than in Golden Queen. 

 Compton's Early. Light, more than in Golden 

 Queen, the same as in North Dakota. 



Staining Reactions. — Continued. 

 WUh Safranin. — Continued. 



Z. mays var. indenlata: 



Early Leaming. Light, more than in Golden Queen. 

 Hickory King. Light, more than in Golden Queen, 



same as in Early Loaming. 

 Z. mays var. saccharata: 



Stowell's Evergreen. Very Ught, less than in Golden 



Queen. 

 Black Mexican. Very light, less than in Golden 



Queen, and the same as in Stowell's Evergreen. 

 Golden Bantam. Very light, less than in Golden 



Queen, and the same as in Stowell's Evergreen. 



Temperature of Gelatinization. 



Z. mays var. everta: 



Golden Queen. 62.5 to 64° C, mean 63.25°. 



White Rice. 6L5 to 63° C, mean 62.25°. 

 Z. mays var. indurata: 



North Dakota. 67 to 69° C, mean 68°. 



Compton's Early. 68 to 69° C, mean 68.5°. 

 Z. mays var. indentala: 



Early Leaming. 66 to 67° C, mean 66.5°. 



Hickory King. 66 to 67.5° C, mean 66.75°. 

 Z. mays var. saccharata: 



Stowell's Evergreen. 66.2 to 67.5° C, mean 66.86°. 



Black Mexican. 64 to 66° C, mean 65°. 



Golden Bantam. 66 to 67° C, mean 66.5°. 



EFrECTS of Various Reagents. 



Reaction wUh Chloral Hydrate-Iodine. 



Z. mays var. everta: 



Golden Queen. Begins immediately; complete in 



most in 30 seconds, in all in 4 minutes. 

 White Rice. Begins immediately; complete in most 



in a minute, in all in 5 minutes. 

 Z. mays var. indurata: 



North Dakota. Begins immediately^ complete in 



most in 5 minutes, in practically all m 10 minutes. 

 Compton's Early. Begins immediately; complete 



in most in 4J'^ minutes, in practically all in 10 



minutes. 

 Z. mays var. indentala: 



Early Learning. Begins immediately; complete in 



most in 2]/z minutes, in all in 10 minutes. 

 Hickory King. Begins immediately; complete in 



most in a minute, in all in 7 minutes. 

 Z. mays var. saccharata: 



Stowell's Evergreen. Begins immediately; complete 



in most in 2 minutes, in all in 6 minutes. 

 Black Mexican. Begins immediately; complete in 



most in 30 seconds, in all in 8 minutes. 

 Golden Bantam. Begins immediately; complete in 



most in 30 seconds, in all in 10 minutes. 



Reaction with Chromic Add. 



Z. mays var. everta: 



Golden Queen. Begins immediately; complete in a 



few in 20 seconds, in all in 75 seconds. 

 White Rice. Begins immediately; complete in a few 



in 25 seconds, in all in 80 seconds. 

 Z. mays var. indurata: 



North Dakota. Begins immediately; complete in a 



few in 40 seconds, in all in 314 minutes. 

 Compton's Early. Begins immediately; complete in 



a few in a minute, in all in 33^ minutes. 

 Z. mays var. indentala: 



Early Leaming. Begins immediately; complete in 



a few in a minute, in all in 31^ minutes. 

 Hickory King. Begins immediately; complete in a 



few in 35 seconds, in all in a minute. 



