
          calls E. centaurium, in his work.  By the way, as you
 are preparing a North American Flora, I think it
 probable Dr. Pickering could help you to a number
 of interesting facts, and perhaps some new plants,
 if you were to visit him, and the five Herbarium
 under his care, at the Philadelphia Academy,  I should
 think him well worth consulting, on such an occasion.
 He knows more of Botany - especially the Botany of
 our [county/country?] than any body I am acquainted with, in
 Pennsylvania.  I shall be happy to hear from you
 soon - and to learn the safe arrival of the present
 package for Dr. Gray, as well as the one I sent last spring,
 containing Poa [pratensis?].  I hope it came regularly to
 hand, and answered his purpose. - once more, good night.
        