192 Trans. Acad. Sci. of St. Louis. 



P. inamoenus. Haberlandt speaks of these as " verfilzten 

 Zellen." Endosperm is but sparingly developed, usually con- 

 sisting of a row of tabular cells, the aleurone, followed by 

 one or more rows of thick-walled cells. The nucellus is re- 

 duced. The embryo contains fat, protein, and starch. Poorly 

 developed palisade cells, scarcely to be distinguished from the 

 parenchyma, occur on the upper face of the cotyledon in some 

 species, but are usually absent. For the numerous chemical 

 analyses, Harz, Konig, and Jenkins and Winton should be 

 consulted. 



Phaseolus perennis, Walt. (P. polystachyus, L., BSP.) 



PL XXI. f. 5-5h. 



Brown testa and endosperm 132-265 /u, thick. The upper 

 part of the nutrient layer variable. 



Malpighian. Cells are 109-115 /i long. Cuticle slightly 

 uneven ; cuticularized layer poorly developed ; several pores 

 project into the walls from the cuticularized layer, to the light 

 line or in some cases much beyond; the light line is narrow 

 and occurs under the cuticularized layer. Cell-cavity is large 

 at the base, gradually tapering upward, irregular in outline ; 

 small remnants of protoplasm occur in the cavity, and also 

 considerable brown pigment and tannin. 



Osleosderid. The cells are thick-walled, 14 /x long, I- 

 shaped, with large elongated intercellular spaces. 



Nutrient. This layer is compressed and differentiated into 

 two parts ; cells of the upper part smaller, elongated and 

 thinner-walled ; in the hilar region it consists of star-shaped 

 parenchyma with large intercellular spaces. Cells of the lower 

 part are larger but variable. They contain a large amount of 

 pigment and tannin. 



Endosperm. Laterally a single row of cells, but in the 

 micropylar region more strongly developed. The internal 

 part of the endosperm consists of thick-walled elongated cells. 

 These carry some protein grains. 



Embryo. First row of cells smaller ; exterior walls thick- 

 ened ; lateral walls are thinner; cells below the epidermis 

 larger and more loosely arranged, with intercellular spaces in 

 the angles. Upper portion of the cotyledon in germination 

 with small epidermal cells much as in the lower part, fol- 



