509 
by the parts of the flower and fruit alone. In doing 
this, I have kept the exotic species in view, of which 
the Linnean collection and those of many botanists 
of Switzerland, with the Greek herbarium of my 
lamented friend Sibthorp, have furnished me with 
almost all that are known. The principles I have 
adopted prove amply sufficient, being no other than 
those by which Linnzus was, on the whole, so suc- 
cessful, though he deserted them in the arrangement 
of the tribe in question. But what affords me most 
satisfaction is, that I am thus enabled to keep en- 
tire almost all his own genera.” 
In a letter addressed to Mr. D. Turner in January 
1823, Sir James tells him that “the Umbelliferz 
occupy me so that I have hardly time to write a let- 
ter; but I have the satisfaction of thinking I am 
doing some good, and that they will all be found 
capable of being arranged in good natural genera 
by their fructification alone. In reply to an objec- 
tion of yours, please to observe these plants are 
(without exception perhaps) to be found in flower 
and seed at the same time. 
“T have better opportunities of specimens in every 
state than most people who have laboured at this 
subject, having the herbaria of Linnzus, Davall, 
Reynier, Favrod, with my own. I have also Cus- 
son’s numerous letters explaining his ideas. 
“JT am happy that you think of our late conversa- 
tion with the pleasure that I do, for indeed I have 
seldom been more pleased with any. We must have 
more such. I am often in the way of so many 
whom it is hopeless or worthless to converse with, 
