
          as far as they have been discovered
in our district.

Secanova, Racomitrum, Oscillatoria, Rivularia, Evernia,
Monchella and Demtium. Also
send any thing else, which you find
has been omitted. How shall I get the
localities of Crypts? You cannot write
them off for me. I will tell you a way
which will be practicable. Open the
3d Ed. at any genus, for example Opgrapha.
Then set down in your letter
the page; and under it the number of 
the species counting from the top; and 
against each number our character for
the locality. As for the localities of the
species of Opegrapha, if mecularis grew 
in Pennsylvania, abnormus near New 
York and minimalis above Northampton
where [?] [?], set it down thus
P. 366. Spec. 4, P_5, C_6, N. In this way a
vast many localities might be given in our
letter. Remember that we want all you 
send in the order of the book, to keep
pace with the printing.

You wrote me soon after the 3d Ed. 
was finished, that I ought to have referredd
to the old Dutchman somewhere
south, who has written something on the
Crypts of this country. Do either send
me his book by mail, if a possible
or, send me such things from it, as 
I ought to publish.

        