OLDKH PO'I'OMAC OF VIKiilMA AND MAUYLAND. 



I .) 



known jihiiit Ix'ds in \'ii<iiiiia. 'I'liis cvidcnc*' is jMit in niofo available 

 fofin in ihc lablc of disti'ihution which I apixMid to the ropoi't. 



Several years ajjo 1 was informed that the United States National 

 Museum was to undei-take the pul)lication of a revised edition of my 

 Guide to the I'iora of Washinfjton and \'icinity," l)rinjj;in<r; it down to 

 date and reari-anjiinii; t\\e matter to conform 1o mod(>rn ideas of classi- 

 fication and noinenclatuic. The different departments were to be 

 elal)orated bv sjiecialists in each. I offered to revise the introductory 

 matter and to contribute a chaptei- on the fossil plants from all locali- 

 ties falling within the area covered b>- the original work. This, in brief 

 terms, extended from Oreat Falls on the nortli to Mount Vernon on 

 the south, and back fi'om the river to the Piedmont Plateau on the 

 west and to the divide Ijetween the Potomac and Patuxent drainages 

 on the east. Of the localities treated in Professor l-'ontaine's report 

 now to l)e considered it woidd thei'efore ha^'e included the following: 



Mount Vernon. 



Hell Hole. 



Mouth of Hell Hole. 



Chinkapin Hollow. 



vSixteenth street, Washington. 



New reservoir, Washington. 



Terra Cotta, D. V. 



Langdon, L). V. 



Queens Chapel i-oad, 1). C. 



Hosiers Bluff (Fort Foote) , Md. 



Kiverdale, Md. 



Berwyn, Md. 



Bewley estate, Md. 



Muirkirk, Md. 



Con tee, Md. 



Ivy City, D. C. 



Some of these localities were unknown at that time, but I had 

 in my hands the collections from Mount Vernon, Chinkapin Hollow, 

 Sixteenth street, the new reservoir. Terra Cotta, Rosiers Bluff', and 

 Muirkirk, nearly as they are known at the present time. 



I set about, as time would permit, the determination of these col- 

 lections, and studied many of the specimens, giving names to several 

 new species and preparing a list of all the fossil plants that would belong 

 to the flf)ra of Washington and vicinity. I intended to describe the 

 new species and to write the chapter, Imt learned that the pul)lication 

 of the revised edition had been somewhat indefinitely postponed. 1 

 therefore suspended work on these collections, and when the time came 

 for the general treatment of the Potomac flora for the present paper 1 



a Bull. U. S. Nat. Mils. No. 22. 1881. 



