128 



C. Flora of Eagle Lake and Vicinity. 

 H "Walton Clark. 



The work einbodiod in tho followiuti' rt-port was accomplished l;y the 

 writer, assisted l)y Mr. Charles ^l. VAi. durin;;- the snininers of 189!» and 

 I'.iini. under the ansi)ices of the Ijidiaiia rnivei'sity.Biologiciil Station. Th.e 

 purpose of tlu> worlc is to i)i-esei)t a study of Eagle Lake as a unit of 

 environment as re.i:ai'ds plant life, and the special line of investigatinn 

 was that of tlie vaiions i)]ant a.ugrcvuates of the lake, iiu-hiding their rela- 

 tions to ea(di otiiei- and to that body of water. Many thanks are due to 

 Dr. ('. II. Kigenniann. Hirector of tlie Station, and to Dr. Mottier. Head 

 of Dc^pai'tnu'ut of Botany of the llie Station, for assistance in sugges'iig 

 and nia])i)ing out lines of work. 



.\s ri'gards llie i>l;in of tlie woi'k. it will he iM'lpfnl to tlie readei' to bear 

 in nund that the survey of the area studied was made in a series of con- 

 centi'ic rings. l)(>ginniiig at the northeast corner of the region descril)ed, 

 that is, at the laboratories, and starting soulliward. All descri])tions liave 

 this beginning and seciuence. and the sides of the lak(> are di serilied in tin- 

 following oi'der: (1) east side. (Ui south side. Cb west side. (4i iiorili side 



Eagle Lake is one of the many small lakes of northern Indiana which 

 occupy depressions in the surface of the glacial drift. It is somewhat 

 irregular in outline, and consists of a larg(> main body, a sonu-what nai-row 

 neck or cluiiniel. and a lai'ge bay at tlie west end. According to ^Ir. 

 Large, who made a survey of the lake several years ago (Proceedings Ind. 

 Acad. Sci., 1896), the area of the lake is alout O.Sltl stiuare mile. 



Before entering into a <letailed descriittion of tli{> lake and its flora. 

 however, it may be well to consider lu-icHy tlie sui-i-nunding country. 

 This descri])tion of tlH> I'egion surrounding the lake is not intended to be 

 exhaustive: it is simply preseuli'd as a sort of frame foi- the i)icture of 

 the lalvc itself. The Avli(d(> region from the lake shove to and including 

 characteristic portioris of tlie higli ground beyond the limits of the lake 

 plain, moreover, net only repies(M:ts a sort of unit area in itself, but at 

 the sanu' time inclu(U's an ii-tei'esting \ariety of conditions and furnishes 

 interesting bits of well niarked lii(tl(igi( al arca.s ihat are to be found on a 

 large scale elseAvhere. but whicli here in their limited size offei- very favor- 

 able opportunities for study. 



Eagle Lake and its plain are iiearly suin-cnuuled by a ratner jibrupt 

 terrace of yellow sand, which rises at varying distances from the lake 



