GLOSSARY 675 



Embryogenic. — Pertaining to the development of the embryo. 



Embryo Sac. — The cell in the ovule in which the embryo is formed. 



Endocarp. — The inner layer of the wall of a fructified ovary. 



Endosperm. — The nutritive material stored within a seed, originally deposited within 



the embryo sac. 

 Ezocarp. — The outer layer of the wall of a fructified ovary. 

 Extine. — The outer coat of a pollen grain. 



Fasciation. — A diseased condition resembling the growth of several stems into one. 

 Fecundation. — The fusion of two gametes to form a new cell. 

 Fecimdity. — The ability of flowers to produce seeds that will germinate. 

 Fertility. — (1) Of flowers, the capacity of producing seeds that will germinate; (2) 



of soils, the crop producing power. 

 Fertilization. — (1) The fusion of two gametes to form a new cell; (2) the application of 



fertilizers. 

 Frenching. — A disease characterized by loss of color in leaves between the veins. 

 Fruitfulness. — The capacity of producing fruit. 

 Fruit Setting. — A development of the ovary and adjacent tissues following the 



blossoming period. 

 Gamete. — A miisexual cell which must fuse with another gamete to produce a new 



individual. 

 Glucosides. — Compounds that yield sugar and some other substance, usually aro- 

 matic, on hydrolysis. 

 Guanine. — A basic nitrogenous compound related to uric acid; one of the purines. 

 Gynaeceum. — The pistil or pistils of a flower. 

 Hermaphrodite. — A flower with both stamens and pistils. 



Heterostyly. — The presence of styles of two or more forms or two or more lengths. 

 Heterotypic. — Reduction division of a cell. 



Histidine. — A basic amino-acid which is a product of protein digestion. 

 Homotypic. — As applied to cell division, involving the usual process of karyokinesis. 

 Hydrolysis. — Chemical splitting by taking up the elements of water. 

 Hygroscopic Coefficient. — The percentage of soil water retained in contact with a 



saturated atmosphere and in the absence of any other source of moisture. 

 Hypoxanthine. — A basic nitrogenous compound related to uric acid; one of the 



purines. 

 Imbibition. — The process of absorption, usuall}^ by a solid. 

 Imperfect. — In flowers, unisexual. 

 Impotence. — Inability to produce functional gametes of the one sex or the other; 



sometimes used in a more general sense to denote sterility. 

 Inconjpatibility. — Of sex cells, the inability to unite and form a fertilized egg that can 



grow to maturity. 

 Interfertility. — The ability of one variety to set fruit and produce seeds that will 



germinate when poUenized by another variety. 

 Interfruitfulness. — The ability of one variety to set and mature seed-containing or 



seedless fruit when pollenized by another variety. 

 Intersexualism. — Sex intergrades; a term referring to the varying degrees of develop- 

 ment of the two sex organs in the same plant; relative maleness or femaleness 



of the plant. 

 Intersterility. — Inability of one variety when pollenzied by another variety to set 



fruit and produce seeds that will germinate. 

 lutine. — The inner coat of a pollen grain. 

 June Drop. — The abscission of partly developed fruit (often occurring in June). 



