14 ARRANGEMENT. ORDERS. 



If about twelve, DODECAGYN'IA. 



Many pistils, that is, more than twelve, 

 POLYGYN'IA. 



In the fourteenth class, Didynamia, the orders, 

 which are two, depend upon the seeds being con- 

 tained in seed-vessels or not. They are called, 



GYMNOSPER'MIA, when the seeds are naked or 

 without a covering : and 



ANGIOSPER'MIA, when the seeds are inclosed in a 

 seed-vessel. 



The orders of the fifteenth class, Tetradynamia, 

 are also two, and are determined by the shape of 

 the seed-vessels, which are called Pods. 



The first has broad short pods, and is called 

 SILICULO'SA. 



The second has long pods, and is named SILI- 

 QUO'SA. 



In the sixteenth, seventeenth, and eighteenth 

 classes ( Monadelphia, Diadelphia, and Polyadel- 

 phia), the orders are known by the number of 

 Stamens. 



The nineteenth class, Syngenesia, contains five 

 orders : but as they are rather difficult to under- 

 stand, it will be time enough to learn them when 

 you come to examine plants of that class, which I 

 should not advise you to do for some time. Nor 

 is it necessary for you to learn at present the 

 orders of the five remaining classes, which are 

 also difficult. 



