1 8 ON THI ASCLEPI ADEJE. 



be applied. But nothing can be more constant 

 than the manner in which the pollen is attached 

 to the processes of the stigma in each species ; and 

 as considerable differences in this respect take 

 place in various species, I have with advantage 

 employed these in the new generic divisions of the 

 order which 1 have attempted to establish, and to 

 which I now proceed. 



As I have every where mentioned the sources 

 from which my knowledge both of genera and 

 species is derived, it becomes unnecessary particu- 

 larly to notice here the extent of my obligations to 

 the unrivalled Herbarium of Sir Joseph Banks, 

 who, with his accustomed liberality, has permit- 

 ted me to examine, and, where necessary, to dis- 

 sect such specimens as seemed to have any pecu- 

 liarity of structure, 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. 



