139 



Along' the lake shore there is in many places a narrow fringe of willows 

 and (logwoods. These probably once formed a continuous stretch, but 

 have been removed by artificial means. Just edging the lake, too. was 

 found, during the sumtuer of 1S!>9, an abundance of creeping ScldfihicJIa, 

 but it was not nearly so abundant in liXM). 



PONDS. — .Tust as the lake occupies a large liollow in the surface of the 

 drift, so are lesser hollows in the surface of the lake plain, and in the 

 region surroiuiding the lake, occupied by ponds. In some of- the shallower 

 ponds, and tliose remote from the lake, the sur.ply of water is temporary 

 and they are dry basins diu'ing the drier parts of the year. The ponds are 

 exceedingly varied in appearance and flora, and are interesting objects to 

 study. They are really lakes in miniature, and may represent future stages 

 of the lake itself. Lack of space, however, will prevent the discussion of 

 this interesting featin-e of the region, except to say that their quiet Avaters 

 contain in abmidance many interesting aquatic forms wliich are not to be 

 found in the lake, or which occur there only in limited (piantity. Among 

 these plants are the various ducl<weeds. Lciiiiia minor, L. trisulca, HitirodrJUi 

 l>ohirli'iz<i. Wolfjfia cohiniJtidno and 11'. hncHlcnsisi. whicli are to be found in 

 the ponds and lagoons on the eastern side of the lake. Other ponds con- 

 tain an abundance of liverwort, two species, Bicciocarijus nutans and Rlccia 

 flititans. being abundantly represented. Some of the ponds containing foul 

 Avater have (trieiihirid nihjiiris in almndance. Here the bladders are black 

 and full of dark, solid dirt, and the plants lilossom profusely. This plant 

 is found only scantily in the lake itself, and in this situation the bladders 

 are empty and more or less transparent. The whole plant is bright green 

 and I have not seen it in blossom at all. One of the ponds (Market street) 

 contained Brasenia in abundance, and it blossoms profusely. A small 

 patch was found in the southAvestern part of Eagle Lake, but I have never 

 seen it in bloom there. One of the ponds east of the lake contained large 

 balls of nostoc in great abundance. 



THE LAKE PROPER.— Preparatory to the task of mapping the vari- 

 ous plant aggi'egates of, the lake, it was found necessary to measure along 

 the shore line, and so become acquainted Avitli the relatiA'e distance of 

 A'arious objects. This Avork AA'as done quite carefully and lengthy notes 

 taken concerning the nature of the shore. Stations AA'ere established and 

 full descriptions Avritten of neighboring objects, so as to make their recog- 

 nition possible. Tills Avas the most laborious and tedious part of the Avork. 

 and not particularly fruitful of direct results, for of the great mass of 



