THE PEAIEIES 197 



Station 2 was located iu the grove on the leeward side of the 

 same ridge at the same altitude as station 1, and ninety-five feet 

 east of it. It was stationed fifty feet east of the west edge of the 

 grove shown to the left in plate IX, figure 1, and also in plate 

 VIII, figure 2. The latter figure also shows in the foreground 

 the border strip, about twenty-five feet wide, which separates the 

 grove in which this station is located from the typical prairie sur- 

 rounding station 1. The latter station is located about twenty 

 feet west of the west side of this border strip. The border strip 

 follows the very top of the ridge between stations 1 and 2, and the 

 latter station is sheltered partly by this intervening low ridge and 

 to a greater extent by the higher ridge to the south, besides being 

 under cover of the forest. 



The observations at stations 1 and 2 should be compared to 

 show the combined influence of the protecting ridge and grove 

 on evaporation. 



The floras of the two stations were xqtv distinct. That of the 

 prairie at stations 1 and 3, which is essentially one, is recorded in 

 the first (or loess) column of the table of prairie plants. In the 

 immediate vicinity of station 2 the following plants were col- 

 lected, practically all. excepting the introduced weeds, belonging 

 to the flora of the forest •}^ 



Aquilegia canadensis Psedera quinquefolia 



Arabis canadensis Quercus macrocarpa 



Campanula americana Ranunculus abortivus 



Chenopodium album (introduced) Rhus glabra (large) 



Corylus americana Eibes gracile 



Crataegus mollis Silene stellata 



Cystopteris fragilis Smilax hispida 



Dicentra cucullaria Solanum nigrum (introduced) 



EUisia nyctelea Symphoricarpos orbiculatus 



Elymus striatus Taraxacum officinale (introduced) 



Eupatorium urticaefolium Tilia americana 



Festuca nutans Ulmus americana 



Fraxinus pennsylvanica Ulmus fulva 



Hydrophyllum virginianum Viola sororia 



Ostrya virginiana Vitis vulpina 



Polygonatum commutatum Zanthoxylum americanum 



Prunus virginiana 



"The nomenclature used throughout this paper is that of Gray's Man- 

 ual, 7th edition. 



