T'O make a complete study (it a solid mass of tissue, Sections must 

 be cut at different planes to each other, i'/.? —Transverse, Radial- 

 longitudinal ly, and Tangentia!-lon<^itudMially. Each Section wiien 

 placed under the iMicroscope will present to the observei' a surface cut 

 at rii>ht an*fles to each other. 



DIAGRAM OF A DICOTYLEDONOUS STEM. 



1— Tani^ential area, passing through the Bast Fibres, (see Nos. 51 to 53). 

 2 —Tangential area, passing through the Xylem (wood). 

 3— Radial line, passmg through the Pith. 



