THE CORRESPONDENCE OF SCHWEINITZ AND TORREY 129 
of, I would remark, that my knowledge of this tribe of plants 
is so limited that if I were to draw one up it would only mislead 
' you. Please therefore to send me almost anything not in the 
catalogue of New York plants [86], & not in the collection I sent to 
you—especially your new species. 
I am making great exertions to extend my collection of foreign 
cryptogamia & I have already a great many species. Profs. 
Sprengel, Treviranus, & Agardh have sent me fine collections, & so 
has Mr. Casstrém of Stockholm, Mr. Sealy of Cork, &c. With the 
aid of these I study the species of this country with more satisfac- 
tion than I otherwise could, but still I labour under considerable 
difficulty for want of books. I want Schwagrichen’s supplement 
[66] & many other books. Agardh informs me he has finished his 
Species Algarum [3]. I would wish to know whether the Supple- 
ment to Persoon has ever been published.. The Synopsis [59] is 
now becoming antiquated. 
Any plants in your list No 1 except these below 
- (which I already possess) would be highly acceptable 
[Lists 88 species] 
I rejoice to hear you [say] that you have turned your attention 
to a work on American Cryptogamia. I hope nothing will occur to 
prevent what is now so great a desideratum. It is really a re- 
proach to our botanists that none of them except Dr. Muhlenberg 
ever attended to this interesting department of Botany. Should 
the Flora Lancastriensis[*] ever be published we shall have much 
assistance in the Orders of Musci & Lichenes, though the Father of 
American botany did not neglect the other families. 
Mr. Nuttall [55] seems to hint that Mr. Collins will publish 
something on the Cryptogamia of this country (in his preface). 
But I think it is very doubtful as this gentleman carries his caution 
so far that it is difficult to get his opinion on the most common 
* (Youmans, W. J. Gotthilf Heinrich kanst Muhlenberg. Pop. Sci. Mo. 45: 
693, 696. 1894. Reprinted in Youmans, W. J. Pioneers of science. 
York. 1896. “In July, 1785, Muhlenberg communicated to the hiatal paa 
= er an aie o a unio A: aa of Lancaster) containing 
habits. . . . Unfortunately 
they have not been published.” A list al the plants described in this manuscript 
was, however, published by the Society (Trans. Am. Phil. Soc. 3: 157-184. 1793).] 
