90 Proceedings of the Ohio State Academy of Science. 



southwest and west, the latter zone extends across the lake and 

 unites with that of the west shore at the mouth of the southwest 

 feeder. 



Another interesting feature of this region is the rapidity with 

 which the lake between the island and canal is being filled in. 

 Part of it is already above the water level and supporting a meso- 

 phytic vegetation. 



///. Islands built on a foundation of exposed peat. 



Near the north shore of the lake, between Cranberry Island 

 and the woodlot, a small mass of exposed peat was studied as an 

 example of the third class of islands. The islet, Sept. 23, 1910, 

 was a small mass of peat 12 feet long and 8 feet wide at the 

 broadest portion, with a very irregular shore line, and had been 

 so recently exposed during the season that the surface was wet 

 and stranded Spirodela, Ceratophyllum and Cladophora were still 

 fresh and green. 



The surface slopes very gently from the water level at the 

 margin to the highest point just north of the center which is 8 

 inches above the water. On this highest portion are 4 Bidens 

 cernua, 3 Bidens frondosa, 5 Salix nigra from 2-3 years old and 

 6 Polygonum acre. These are the tallest plants, 1.5-2 feet tall. 

 In their shade are 2 seedling maples, 4 seedling Hibiscus and 

 numerous Eleocharis acicularis. In the center is a Lotus leaf. 



The dominant species on the lower portion are Eragrostis 

 hypnoides, Cyperus strigosus and C. erythrorhizos. The Era- 

 grostis lies prostrate with roots at each node. Cyperus strigosus 

 is erect and varies in height from 1-6 inches, while C. ery- 

 throrhizos is about 2 inches tall. Associated with these are 20 

 Bidens cernua seedlings, 7 Hibiscus moscheutos seedlings, 2 

 Amaranthus hybridus in bloom, 3 small Typha latifolia near the 

 margin, 14 Impatiens bifiora seedlings, i Decodon verticillata on 

 the east side near the edge, 4 small Peltandra virginica on the 

 west, with a number of stranded Potamogeton lonchites. Two 

 areas of about one square foot each covered with the closely set 

 capillary culms of Eleocharis acicularis, i Ilysanthes gratioloides, 

 3 seedling Erigeron sp., i seedling Solidago sp., i Homalo- 



