206 Trmis. Acad. Sci. of St. Louis. 



Schrad., and G, reniformis, G. Don; the latter was also 

 studied by Pringsheim. Chalon studied seventeen species, 

 but only with reference to endosperm, except C. Fistula, L., 

 of which the Malpighian cells as well are described. His 

 figures are somewhat diagrammatic. The height of these 

 cells is simply compared with some other Leguminosae 

 studied by him. Nadelmann studied the development and 

 the mucilaginous endosperm of G. Fistula, L. and G, 

 corymhosa, Lam. Tschirch and Oesterle studied G. an- 

 gustifolia, Vahl. The mucilaginous endosperm of Gassia 

 is also described by Tschirch in his Angewandte Pflan- 

 zenanatomie. Lubbock has studied the germination of G . 

 Fistula L., G, circinata, Benth., and G. obovata, Coll. De 

 Candolle's germination studies agree with those of Hitch, 

 cock and Holm. So far as studied, all the species of 

 the genus agree in the mucilaginous endosperm, the sclerotic 

 nutrient layer, and the but slightly diflferentiated osteo- 

 sclerids. A second osteosclerid layer below the nutrient 

 is followed by several rows of thin-walled cells — the inner 

 testa. Starch is absent from the embryo, but there is an 

 abundance of protein and fat. 



Cassia Chamaecrista, L. 



Fl. XX. f. 4-4e. 



Testa and endosperm measure 160-265 /x in the narrow 

 parts of the seed; in the wider parts, 415 /a. Cotyledons 

 400-415 fjL across. 



Malpighian, Cells 44.8 jjl long. Cuticle thickened, brown- 

 ish, followed by a wide cuticularized layer ; the narrow light 

 line occurs under the cuticularized layer; the upper third 

 of the cell is more refractive ; several pore-canals project into 

 the walls beyond the wide refractive portion. The cell-cavity 

 is wide at the base, gradually tapering upward, enlarging at 

 the upper light line. The cells contain a large chromatophore 

 with some protein and a little coloring matter. 



Osteosclerid. The thick- walled cells are nearly colorless, 

 84 /i long, with a rather large intercellular space between adja- 

 cent cells ; occasionally these cells are not essentially different 

 from those of the nutrient layer. 



Nutrient. Consists of thick-walled sclerotic parenchyma. 



