152 PRINCIPLES OF BOTANY, ETC. | 
in the tenth class stand many plants with papiliona- 
ceous flowers. These two faults are not the greatest 
which may be attributed to this system: it is a more 
important objection that Linneeus has numbered the - 
stamina in the first classes without attending to’ their 
insertion, while in the twelfth he remarks that they 
are inserted in the calyx, and in the twentieth, that 
they stand on the pistillum. In the nineteenth class 
are comprehended all the compound flowers, and 
vet he drags into the last order of this class other 
plants whose antherze are only sometimes united. 
ft is also to be regretted, that m the 21st, 22d and 
73d classes Linnzus has taken notice of different 
sexes in the same plant, which he had not done be- 
tore; there being many plants in the former classes 
that properly belong to these. 
§ 142. 
‘These defects and some others, from which no 
system can easily be exempted, have suggested to 
several botanists the possibility of correcting them 
and making the system more useful. Among all 
the improvements of the Limnzean system, those by 
‘THUNBERG, seem to be the chief. He has reduced 
the number of classes to twenty, by referring. the 
plants of the 20th, 21st, 22d and 23d classes to 
others, according to the number or connection of 
the stamima. | 
All the plants which stand in the 20th class ought 
to have the stamina placed upon the style; but the 
most of the plants arranged by Linneus in this 
class want these characters, the genus of Orchis 
1 alone 
