184 MINUTE STRUCTURE OF THE SEED. 



III. Partially soluble in ten per cent sodic chloride solution. 



a. Entirely soluble in one per cent sodic carbonate solu- 



tion ; e. g., Clarkia pulchella. 



b. Entirely soluble in dilute potassic hj^drate. 



(a.) Grains without crystalloids ; e. ^r., Lythrum Salicaria. 

 (ft.) Grains with crystalloids ; e.;/., Juniperus communis. 



513. The appendages of the seed known as the strophiole (at 

 the base of the seed), the caruncle (at the micropyle or orifice), 

 and the membranaceous and pulpy forms of arillus (see Vol- 

 ume I. pages 308, 309) do not call for further remark. 



The separation of the fruit at maturit}-, and the separation of 

 the ripened seed as well, are due to changes analogous to those 

 described in 458, under the " Fall of the Leaf." Some of the 

 special forms of mechanisms bj' wliich the detachment occurs 

 may be examined in Part II., under " Dissemination." 



