22 



of the seed are also characteristic; they are from 170 — 250/x in 

 length, of which an outer layer of about l-oth the total height 



Figure 13 

 Fig. 13. Carob Bean. (1) Wrinkled bodies in cells of mesocarp and 

 (2) endosperm cells with thickened walls. 



is swollen and shows no cell cavity. The endospemi cells are 

 striking on account of the enormously thickened cell wall. These 

 cells are best seen in sections cut from the white horny fragments 

 of the seed. Fig. 13 shows the elements of the carob bean which 

 have been mentioned. 



SOY BEAN. 



{Soja hispida, Moench.) 



Soy beans are sometimes found in cattle feeds, but are usually 

 ground into the form of meal. The seed itself varies from 5 — 10 

 m.m. in diameter, and is usually nearly globular, but occasionally 

 is somewhat flattened. The color is varied, being yellow, brown 

 or even black. 



In general the elements of the seed resemble greatly other 

 legumes, but it is characterized by the absence of all starch 

 grains, and the presence of thick walled layers of spermodeiTn cells 

 which have a proteid content. This layer is not always easy to 

 find in ground preparations, but is quite characteristic. The cells 

 themselves are rectangular or polygonal in shape and are from 

 15 — 45/i in diameter. 



The palisade cells are about the same as those of the common 

 bean, but the column cells are thicker and heavier looking than 



