��ON THE ASCLEPIADKJC. 199
constant than the manner in which the pollen is attached to the processes of the stigma in each species ; and as con- siderable differences in this respect take place in various species, I have with advantage employed these in the new generic divisions of the order which I have attempted to establish, and to which I now proceed.
As I have everywhere mentioned the sources from which my knowledge both of genera and species is derived, it becomes unnecessary particularly to notice here the extent of my obligations to the unrivalled Herbarium of Sir Joseph Banks, who, with his accustomed liberality, has permitted me to examine, and, where necessary, to dissect such specimens as seemed to have any peculiarity of struc- ture, and has thus enabled me to found my genera on a more satisfactory induction than I could have done in any other part of the world.
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