197 
84. I have shown in The Quinology of the East Indian Plan- 
tations the elaborate manner in which the bark is renewed by 
the cinchona plant, after having been removed for the purpose 
Longitudinal Section of a fragment of a sucker of Paulownia imperialism 
showing the structure of a very young bud : fr, a small portion of the 
fibro-vascular system of the root which produced the sucker ; p, a punc- 
tuated vessel of this part ; g, the generative layer ; c, external cortical 
tissue ; e, cellular protuberance, which proceeds from the internal cortical 
tissue, raises the external cortical tissue c, and in which is seen a very 
young bud b : the base of this bud is inserted in the generative layer g 
of the sucker ; this bud is terminated by little projections /, which 
represent the first nascent leaves ; vessels v' contiguous to those of the 
generative layer v, pass along its whole length, they are in relation with 
the lower part of the sucker. — (From the Annates des Sciences 
Botaniques, t.’vii., viii. (1847), p. 291.) 
Cortical tissue. Rudiments of the first leaves. Internal cortical tissue. Cells very small and 
faintly traced. Young bud forming. Extremity of the vessels. Couche gdneratrice. Fibro- 
vascular system . 
