188 Trans. Acad. Set. of St, Louis. 



thin-walled cells ; in mature specimens this layer is much 

 compressed, especially in the lower part. 



Nucellus. Consists of a much compressed layer. 



Endosperm. Much reduced and compressed. 



Embryo. The epidermal cells of the cotyledons are much 

 smaller than the underlying cells ; they contain no starch, or 

 very little ; the underlying starch cells are large and irregular, 

 with small intercellular spaces. These cells contain an abun- 

 dance of starch grains which measure 14X16.8-19.6X25.2 

 -20.4X36.4 yLt, each grain with a prominent rift in the center. 

 It is well known that the cotyledons do not expand in germina- 

 tion as they do in Phaseolus^ Desmodium, and many other Le- 

 guminosae. Palisade cells are uniformly present on the upper 

 side in species where the cotyledons unfold, except in some 

 Phaseoleae. In the pea the cells of the inferior and superior 

 sides are similar. 



CiCER, Tourn. 



Harz, and Tschirch and Oesterle have described the struc- 

 ture of the common species. One of the striking features of 

 this species is that the Malpighian cells have irregular lateral 

 walls. 



CiCER ARIETINUM, L. 



PI. XXIX. f. 2-2c. 



Testa 200-225 /t thick. Endosperm reduced or wanting. 

 Starch is present. 



Malpighian. Cells vary from 60-70 /x long, very irregular 

 near the hilum, the surface of the seed in this region appearing 

 minutely pubescent. Cuticle not strongly developed ; cuticu- 

 larized layer but slightly developed ; the lateral walls very 

 irregular below, thick above ; light line in the upper part of 

 the cell. Cell-cavity wide below. Walls color blue with 

 chlor-iodide of zinc. 



Osteosclerid. The I-shaped cells 20-33.5 fi long, with 

 large intercellular spaces. Walls, except the middle lamella, 

 color blue with chlor-iodide of zinc, the middle lamella, 

 brownish. 



Nutrient. This layer is differentiated into two parts ; the 



