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Sect. XX 



NATURAL CLASSES 



565 



fome of the claffes have appeared to 

 others, as they feemed to approach 



were deduced from the proportioi 



me to be more excellent th 



On fur 



this fubjea, I perceived that thofe claffes, which 



fituations of the ftamina, or 



hich included the number of the ftamina along with then- propor- 

 tions and fituations, were more natural claffes than thofe, which were 



diffipouiOied fimply by the number of them. ^ 



termed Dydynamia and Tetradynamia, which 



Th 



th 



lies 



hus the ciaiies lermcu x^j.^.^..^ , n. • 



derived from the proportions and fituations of the ftamina 



th 



mber 



derfully 



which may be added 



the claffes Icofandria, and Polyandria, as their diagnoftic charader 



flits in the fituation 



f the {lamina 



the calyx or petals in th 



former clafs. and on the receptacle in the latter, though the names 



■ to their num- 



f thefe claffe 



fo happy 



they fimply refe 



bers which are unfortunately very variable. , , ^ 



Some other of the Linnean claffes are diftlnguifhed by the fitua 

 tlon of the filaments, as the Monadelphia, Diadelphia, Polyadelphic 

 and Gynandria ; all which approach towards natural claffes ; and th 

 Syn-enefia, which is difiinguiffed by the adhefion of the anthers, : 



fs beautifully 



pt the laft order 



Many of the orders alfo in the fexual fyftem are natural claffifica 



tions, as the graffe 



s 



the clafs Triandria, the un^bellated pi 



fs Pentandrla, and perhaps 



th 



e 



ciform plants in the clafs 



with many amongft thofe which are termed 



Tetandria ; 

 orders at the end of the Genera Plantarum 

 bly be difcriminated by fome fituation, 01 

 their refpedive ffamina. 



As the claffes deduced fro 

 {lamina alon 



ral 



which might proba 



propor 



or form 



f 



proporti 



fi 



of th 



or conjointly with 



th 



fpea 



P". 



mbei 



ppear 



prod 



diftributions of vegetables 



ban th 



derived fimply from their number; it might have been more fort 



nate for the fc 



of Botany, if th 



& 



of the fexual 



fyftem 



y 



