&T. 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. «+ + 
Iam most clearly of the opinion that any person 
who will make extensive collections of North American 
plants, both Northern and Southern, and include also 
a good collection from Santa Fé, the Platte country, 
ete., 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 $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 small 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- 
sessing 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 
