of a Hybrid Digitalis. 277 



Plate XVII. 



Anatomy of the parts of fructification. All the figures excepting Fig. 4, are more 

 or less magnified. The same letter is always employed to designate the same 

 parts in the different figures. 



Fig. I, 2. Ovarium, longitudinally divided ; in the first case perpendicular to, and 

 in the second down the plane of the dissepiment. 



a. The pedicel with its circle of vascular bundles surrounding the axis : 6, brandies 

 of this circle given off to the calyx and corolla : c, two larger bundles which 

 run up the pericarp, along the future line of its dehiscence, and rise through the 

 whole length of the style : d, separation of the vascular bundles into two bands 

 which enter the two lobes of the placenta near their base, and rising through 

 their substance ef, again separate and subdivide, giving off single vessels to 

 the bases of the ovules : e, the stigmatic tissue descending through the style 

 to the summit of the placenta. 



Fig. 3. A transverse section through the summit of the ovarium, and again through 

 the base of the style. The valve and ovules of one cell are removed. The letters 

 designate the same parts as in the last Figure, with the additions of c, small vascu- 

 lar bundles rising through the pericarp, all of them terminating in the base of the 

 style. 



Fig. 4. Ripened pericarp of the Hybrid, of the natural size. 



Fig. 5. The same magnified, with one valve removed — exhibiting the dissepiment, and 

 one lobe of the placenta, which is still fleshy, and covered by abortive ovules: 

 e a cavity left by the drying up of the stigmatic tissue. 



Fig. 6. Epidermis of the corolla, with a glandular hair and two stomata (/). 



Fig. 7. The same digested in nitric acid and more highly magnified ; g, being the 

 investing pellicle faintly but very regularly striated. 



Fig. 8, 9. Filament ; transverse and longitudinal sections. 



Fig. JO. Anther; a section perpendicular to its coats, exhibiting the triple tier of its 

 fibrous cells. 



Fig. 11. A fragment of the coats of the anther viewed on the inside perpendicularly 

 to its surface, which is partly divested of the fibrous-cells. 



Fig. 12. Details of the anther after it has been digested in nitric acid ; /*, fibrous-cells 

 k, vesicles of the epidermis; /, a grain of pollen peculiarly marked. 



