C 336 1 



in the Stamina or Chives ; and the Medulla^ of 

 pithy part, in the Piflillum and Seed. 



Principally to confirm and illuftrate thefe data 

 is the defign of this tbefis^ which in fa6l is a com- 

 ment on a part of the 24th fedlion of the Introduc- 

 tion to the fecond tome of the Syftem^ p. 9, con- 

 taining a concife view of this dodrine. Before the 

 authoi" proceeds to his immediate fubjedl, he reca- 

 pitulates, with the forementioned, fome other prin- 

 ciples, relating to the life and organization of 

 vegetables, and then endeavours to prove, by 

 appearances obfervable in plarits, that this arrange- 

 ment of parts, and this evolution actually exifts. 

 As this cannot be fo aptly illuftrated in annual 

 and other plants, on account of the tender texture, 

 and quick growth, the author endeavours to 

 exemplify it from obfervations made on the bud- 

 bearing trees in which he obferves, that the full 

 evolution of the parts, from the origin of the bud 

 to the expanfion of the flower, as the final adb of 

 vegetation in each, is a progreflive work, the ac- 

 complifhment of which requires five or fix years^ 

 and that it takes place in the following orders 

 That the Leaves^ which are unconneded with the 

 medullafy fubftance, and derive their origin from 

 the cortical^ are the produce of the firft year ; and 

 in plants and trees that are furnifhed with Bra^e^ 

 or floral Leaves, that fuch are the iffue of the 

 fecond year ; and the Perianthium^ or Cup of the 

 flower, of the third ; the Petals of the fourth the 

 Stamina of the fifth and the Piftil^ &c. of the 

 fixth. Our author endeavours to fuftain this theory 



by 



