iET. 28.] JOURNAL. 135 



just after the adjournment of the Horticultural So- 

 ciety, and while I was glancing over your kind letters, 

 Lindley came to say that he had found Walter's 

 herbarium, for me ! He introduced me to Mr. Fra- 

 ser, to whom it belongs, though not immediately in 

 his possession, who offered to send it up for my exam- 

 ination to the Horticultural Society's rooms, or any- 

 where I chose. I hope to get at it, with Bentham, 

 about Friday. I shall be anxious to let you know the 

 result. . . . 



I am most clearly of the opinion that any person 

 who wiU make extensive collections of North American 

 plants, both Northern and Southern, and include also 

 a good collection from Santa Fe, the Platte country, 

 etc., have his sets named according to our work, and 

 who would devote four or five years to the business, 

 could, if he were really industrious and prudent, re- 

 alize f 1000 per annum (clear). He should continue 

 my grass-book for one thing, giving loose sets only for 

 the present price, and while from time to time he sells 

 off collections as he can, should retain some fifty sets 

 in all the most interesting genera or smaU families, 

 get all the species, and publish them in monographic 

 sets. Knieskern could make, with the aid we would 

 gladly furnish, at least ten times as much money, as 

 long as he lives, as he ever will at physic, besides 

 being engaged in a much pleasanter way. I know 

 how all this should be managed now. Now for Dr. 

 Clapp. Tell him that Brown informs me that he does 

 not think jewel lenses can be depended upon as pos- 

 sessiag any advantage over glass. He has an excel- 

 lent sapphire one, but that is a mere chance, and no 

 other has been made anything like it. They are now 

 almost never made, and appear to be going wholly out 



