of a Hybrid Digitalis. 269 



obtained by tearing the ovarium asunder down the thickness of 

 the dissepiment, which is composed of two skins with parenchy- 

 matous matter between them. The threads of vascular tissue 

 arranged in a circle round the axis of the pedicel (a), after giving 

 off veins to the calyx and corolla (b), and again to the pericarp (c), 

 diverge on either side into the placenta (d), a little above its 

 lowest point, and then ramify or subdivide through its substance 

 into separate fibres (d') which proceed directly to the bases of 

 the ovules. Fig. 3. represents a transverse section of the upper 

 part of the ovarium with the lower part of the style ; the valve 

 which is nearest the spectator being removed, as also are the 

 ovules in this cell. The smaller veins (c ( ), of which more than 

 twenty are seen rising through the pericarp, all terminate in the 

 base of the style ; but the two larger ones (c), which run along 

 the loculicidal edge of the pericarp, rise through the whole 

 length of the style. The stigmatic tissue (e), (Fig. 1. 2. 3.) de- 

 scends down the middle of the style till it comes into contact 

 with the summit of the placenta. When the appearances here 

 represented are examined with the highest magnifiers, their more 

 intimate structure is exposed, as in Plate xvni. where Fig. 1. 

 and 2. are two transverse sections of the pistil, of which the 

 former corresponds to one quarter of the circumference of the 

 ovarium represented in the lower part of Fig. 3. Plate xvn., 

 and the latter agrees with the section through the style in the 

 upper part of the same figure. Plate xvni. Fig. 3. and 4. are 

 longitudinal sections of the same organ, the former through the 

 stigma, the latter through the summit of the ovarium where the 

 stigmatic tissue (e) descends to the placenta, as in Fig. 1. Plate 

 xvn. In these highly magnified sections all the corresponding 

 parts are designated by the same letters as in the former figures. 



