218 ILLINOIS STATE ACADEMY OF SCIENCE 



The Wauconda bog occupies a larger and more irregu- 

 lar depression with a broad shallow extension to the 

 south east, apparently a large bay in the time of pre- 

 historic high water, and a curving valley to the north- 

 east which apparently connected the prehistoric lake with 

 the depression now occupied by Bang's Lake. Both of 

 these extensions are now occupied by swamp vegetation 

 while the bog is confined to a rounded triangular depres- 

 sion to the west. The standing forest is similar to that 

 of the Antioch bog, but the western half of the triangle 

 was cut over about fifty years ago and is now a mixed 

 secondary association containing scattered young tama- 

 racks along the borders, a large number of dwarf birches, 

 sedges and grasses, and among the stumps af the origi- 

 nal trees, relicts of the undergrowth of the original forest, 

 including Linnea, Cornus canadensis, with Leucobryum 

 and other mosses. The central portion of the cut area is 

 low, and apparently holds a small pond at times of high 

 water as it contains vigorous colonies of Typha, Phrag- 

 mites and other early-stage swamp plants. 



The most mature bog found is in the small pocket near 

 the Allandale farm already described (4 — No. 2), and 

 there is nothing to add to that description. 



The most interesting group of bogs is found in two ad- 

 joining depressions northwest of the town of Volo, one of 

 which was partly described as the Volo bog (4 — No. 3), 

 but it has been found to be surrounded by three other 

 bogs which are quite as interesting. From the map in 

 Fig. 6, it will be seen that there are three contiguous de- 

 pressions not actually connected with each other which 

 contain four formations of very different character. The 

 bog described as No. 3 in the preliminary report (4) ad- 

 joins the George Sayer Farm No. 3, and therefore will 

 be known as the Sayer bog. This was treated fully in that 

 report and little needs to be added to the description. It 

 seems almost certain that a twig of ledum was brought in 

 among other specimens at the time of the first visit to the 

 bog, but the twig was not preserved as it was supposed 

 that if it was found so easily in a preliminary reconnois- 

 sance, it would be located easily later. Careful search 

 subsequently has failed to find any trace of this species 



