102 REPRODUCTIVE ORGANS. CHAP. III. 



have adopted the plan of designating the organs in 

 question merely by the general appellation of 

 Perigynandra,* or Perlgonium^ signifying by 

 such appellation the covering of the stamens and 

 pestils, or central organs of the flower ; and de- 

 scribing the envelope as single, if of the organs 

 designated by the terms calyx and corolla one only 

 is present ; and as double, that is furnished with 

 an outer and inner envelope, if both organs are 

 present. 



But owing to the very obvious marks of distinc- 

 tion existing between the calyx and corolla in the 

 flowers of most plants, as well as to their perform- 

 ing functions perhaps altogether different in the 

 vegetable economy, the mode of including both 

 under one general appellation is not nearly so satis- 

 factory as that of designating each by a proper 

 name, and does not seem to have met with much 

 approbation. 



By Ven- Ventenat has suggested a rule founded upon the 

 internal structure of the calyx and corolla ; and 

 Linnaeus has founded his main rule upon the 

 relative situation of the stamens of that of the 

 calyx and corolla ; but as an examination of the 

 merits of these rules would be premature in the 

 present section, depending as they do on parts not 

 yet described, and with which the reader is supposed 

 to be not yet acquainted, I shall only observe that 

 are liable to the same objections with the rules 

 * Neckar. -\ Hud wig. 



