The Microscope. 



173 



usual small, woody cord, composed of first the endodermis, 

 then the phloem, wood prosenchyma and pitted cells. All ex- 

 cept the cells of the phloem are colored a 

 bright yellow. 



oo 



°- 



0£ o 



Leaf. — On 

 the midrib of 

 each leaflet,in 

 elongated 

 clusters, t o - 



°^ 

 



Fig* 6. 



Starch-grains taken wa rd the base 

 from the root. Drawn „ ,, , n L 

 with «. ta . objective, of the leafle ^ 



and the "c eye-piece, are short, uni- 

 cellular, thick-walled white 

 hairs, with minute nodules cov- 

 ering the surface of the hairs 

 (see Fig. 7). Many of these 



are Curved and pointed towards objective, and the "C" eye-piece. 



Fig. 7. 



The epidermal hairs found on the up- 

 per surface of the leaves, directly over 

 prominent veins. Drawn with the i^in. 



the apex of the leaflet. 

 These hairs contain a 

 small amount of proto- 

 plasm, generally dried 

 down in particles, but in 

 the young leaf it is fresh, 

 and exhibits a nucleus. 

 Coloring matter is not 

 found in these hairs. 



The entire upper sur- 

 face of the leaf is covered 

 with a clear, white, thick 

 firm cuticle. This cuticle 

 is laminated, or composed 

 FIfif of five or seven layers of 



Epidermis from the upper surface of the leaf, cellulose placed parallel 

 showing only the epidermal cells and an occa- with the gurface# The cu _ 

 sional nucleus. Drawn with the %-in. objective, 

 and the " C " eye-piece. tide Oil the lower Surface 



of the leaf is more delicate, only about one-half the jthickness 

 of the upper. 



The epidermis on the upper surface of the leaf is about sh> 



