k 



I return to the theme, whioh was broker off •All that I could 

 obtain fron Haworth to Sälen, Pf eif f er, Jucrazini and Labouret I d id. 

 rrocess but was little satified with it; I saw soon, that one could 

 not bulle! further upon it, and active studies in Nature were needed to 

 start anew to build up; for me all these books ceased to have authority, 

 having only bistorical value and giving me (sonetines very valuable) 

 direction indicators. You bave come to the same conclusion, with out 

 wanting to confess it entirely,or being totally clear ab out it* 



Dr. Poselger, with whom I corresporded. first,and whom I net 

 personally later (18 5?) in Berlin and whose not very larere collections 

 and notes I was able to use,was the first to have na de extensive Ob- 

 servation s hinseif in Mexico. However, he is not a true botanists in 

 the real sense of the word; - only a friend of cacti, though he obser- 

 ved caref ully. You yourself had now the opertunity to nake such, obser- 

 vations for an exten.de t tirae and with no^e care and possibly nore pre- 

 knowledge? and you used the Chance thoroughly. That you consider it your 

 duty to presert to the scientific world the lesson of your studies, even 

 if these could not be as all -encompaa sing as you nay have wished, I can 

 only praise.And I gladly will be hei pfui to you as far as ny limited 

 krowledßre ne^ni t s. 



What you say about the careless definition of the home land , or, 

 even nore the specific habitat f is entirely correct andvexed ne oftem 



In America calidiore,- in NovaHispania - Mexico - etc.etc. f or sonetines 

 very exaeting, e.g. near Hacienda San Antonio or such, though there are 

 hundreds of such hacierdas. I nade all my correspondents awares of this.- 

 You are also correct about populär names» though these pro vi de only a 

 very small help, which , however, should not be neglected. Dr. Seemann in 

 London brought this up long ago; Dr. Gregg was very cor scientious about 

 it.- The n 0 te about the reoos-nized relation of Ech . Williansii and 

 A^haloniun is interesting enou*h. What you say about synonyns is undoubt- 



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