Pammel — Anatomical Characters of Seeds of Leguminosae. 147 



occurs in other genera, as in Tonka bean, and in Hierochloe^ 

 a grass. 



Melilotus alba, Lam. 

 PI. VIII. f. 2. 



Testa and endosperm vary in thickness, average 75 ^. Mal- 

 pighian cells as long as the thickness of the endosperm and 

 remainder of testa. 



Malpighian. Cuticle wavy and well developed ; the cuticu- 

 larized layer below with small, conical projections, those of 

 two adjoining cells meeting at the middle lamella of the lateral 

 walls, giving the layer the appearance of consisting of cone- 

 like projections. These cones are also connected with the 

 small pore-canals. This cuticularized layer is highly refrac- 

 tive. The light line consists of a narrow but distinct refractive 

 zone below the conical layer. The refractive zone colors blue 

 with chlor-iodide of zinc. The whole upper part is, however, 

 more or less refractive. The remainder of the cell- wall 

 contains pigment and is colored blue with chlor-iodide of 

 zinc ; the cuticularized layer as well as the conical layer 

 <;olors blue. Small canals project into the walls, in some 

 cases extending beyond the light line. The chromatophores 

 are irregularly distributed in the cell-cavity, some near the 

 base, others in the center. 



Osfeosderid. Cells with a broad base and a small triangular 

 intercellular space above; longitudinal pore-canals in the 

 upper part of the cell, but these do not extend its entire 

 length. 



Nutrient. This layer is much compressed; consists of 

 thin-walled cells, divided into two parts; cell-walls of lower 

 part thicker. Both laj^ers contain pigment and tannin, the 

 upper more than the lower. Cell-w\ills consist of cellulose. 



Endosperrii. The aleurone layer is quite distinct; the cells 

 are rectangular ; cell-walls made up of cellulose. The walls of 

 the remainder of the endosperm, except where it joins the 

 embryo, are thick, consisting of mucilaginous reserve cellu- 

 lose. Cells of the internal layer of the endosperm thick- 

 walled, elongated, containing some protein grains and fat. 



Embryo. Cells of the exterior walls of first row thickened ; 

 they are smaller than those below. All of the cells contain 



