^58 



THE MICROSCOPE. 



midrib and veins, even the minute net-work of veins showing. The 

 hairs add to the roughness of the lower surface. The upper sur- 

 face, b, is more glossy and is tightly studded with small whitish pro- 

 jections. The dried leaves have a reddish-brown color with a fra- 

 grant odor and a refreshing aromatic taste. The lower surface of 

 the leaf, when examined by the microscope, is found to be com- 

 posed of the usual epidermic cells, see a, Fig. 2, quite uniform in 

 size and appearance, while the stomates, b, are like those of other 

 leaves. Each stomate, however, is surrounded by four epidermal 

 cells. The hairs found on the under side of the leaf are not very 

 numerous or uniform in size or appearance. They are multicellular 

 and stellate with many points. The same are seen in Fig. 3 more 

 highly magnified. They are not borne on a pedicle or stem, but 

 directly from the lower epidermis, as seen at a, Fig. 4. The hairs 

 found on the upper surface of the leaf are unicellular, long, slender, 



Fig. 2. 



Lower Epidermis and Stomates.— A, Epidermal Cells. 

 Diameters. 



B, Stomates. Magnified 350 



and borne on an enlarged multicellular base, formed only of epider- 

 mal cells. These hairs are so easily brushed off the leaf that in the 

 commercial leaf the projections are generally found without the 

 accompanying hairs. 



Fig. 4 represents a cross section of the leaf, showing the rela- 

 tions of the projections and hairs to the rest of the leaf. One can 

 easily see here that the roughness of the upper surface is due only 

 to the enlarged bases of the epidermal hairs. The portion of this 

 section seen at c was more highly magnified and represented in Fig 

 5. The upper surface of the leaf is furnished with two rows of 



