Arr, May 1 Dycklarch 22,1850 



Ans. Jim 28 



Your Wellborrr 



Just receive your kind letter of I5th of past month just at the 

 noment , when I had given the last correctiorr to my work-. . Sone, of what' 

 you wrlte, I could perhaps have used.. - I wanted to wait with this- let- 

 ter until I could send to you at the same time the new Editiorr of ny 

 Cacteae in Horto Dyckensi cultea.-; as, however, it will take a few weeks 



until all will be ready for sh^pment, I thought, I could give you sone 

 necessary 



preliminary ( enlighteninents, and that you raay be glad to know,that 

 you will, receive the work in short time: • Besides the copy destined for 

 you I shall! send 3 nore, for Mr. Wislizenius and those of your frie^ds,. 

 in who'se hands your consider it worthwhile to get this work. A partt of 

 the edition, though , is supposed to get into the book trade; but how 

 long will it be, until it will be sent to America ? I do not know.. 



In a short preamble I have given the purpose of this work: It 

 shall! first for the present, and, specially, for the future, point the 

 wayv how, according to ny vlew, one can achieve a correct , syfetematia 

 Organization of the family of Cacti *: I give the reasons, which lead 

 me to the formation of the genera, and. say last, that X wanted tcr 

 append the work to the Enumeratlo of Mr. Pfeiffer as Supplemente. 



I recommend specially to Your Wellborn the Tabula Synoptica^ or- 

 di^is. It is similar to the one given by Porster, but it is nore com- 

 plete, nore definlte» and provides a complete overview of the charac- 

 terlstics, which I used as help. If you will' follow thse characte- 

 ristics sequentially, you, hopefully, will find, that one leads cor- 

 rectly to the other, and that the venera, so to say, form thenselves.. 

 The germen inclusum is a most important characteri stier, which separ- 

 the thribus Melocacteae fron the others. - 



What could be nentioned in the tables only in short words, is 



