56 



The Plant World. 



hides), bird cherry (Prunus pennsyhanica) , etc. As low shrubs 

 occur the blueberries (Vaccinium pennsylvanicum, V. nigrum, 

 V. canadense) , chokeberry (Pyrus arbutifolia) and such herbs as 

 Amianthium muscaetoxicum, bristly sarsaparilla, (Aralia hispida), 

 bracken fern (Pteris aquilina) together with thickets of red 

 raspberry (Rubus strigosus). 



Lost Pond is in a later (not the next )stage of bog develop- 

 ment. Here the open water has entirely disappeared, except 

 in a small secluded area at the upper end of the pond (Figure 

 3, L). In the yearly visits the writer has made to this inter- 

 esting bog from 1903 to 1908 he has noticed the advance of 

 the shrub and tree vegetation out upon its surface, which in 

 some places remains a quaking bog (Qb), into which a stick 

 may be thrust a distance of fifteen to eighteen feet without 

 touching bottom. This bog occupies an irregular depression 

 with its outlet through a narrow valley between two morainic 

 hills. The zonal arrangement of plants noticed at Half Moon 

 Pond is not seen except around the small circular lagoon at one 

 end of the pond (L). The surface of this lagoon is covered with 

 patches of (A) the great yellow spatter-dock (Nymphaea advena), 

 tall sedge (Dulichium arundiaceum) , growing out of small 

 islands of muck fringed with the sundews (Drosera intermedia 

 and D. rotundifolia) (D), while near the edge are associations of 

 bladderwort (Utricular id). This lagoon is bordered by a sphag- 

 num circumarea in which peat mosses, pitcher plant (Sarracenia 

 purpurea) (S) and various sedges are associated. Back of these 

 plants occurs the leather-leaf (+), which forms a clearly defined 

 circumarea. Scattered amongst the dense masses of this shrub 

 occur a few pitch pines (Pinus rigida) (f). The third circum- 

 area consists of a low fringing thicket of steeple-bush {Spiraea 

 tomentosa), high bush blueberry (o), pale laurel (Kalmia glauca), 

 rhodora with an occasional pitch pine and clump of mountain 

 holly (•). The outlet of this lagoon is choked by a mass of 

 sphagnum in which the high bush blueberry, white swamp 

 azalea (Rhododendron viscosum), larch and white birch occur. 

 Back of this circumarea is the higher, dry ground with a forest 

 formation of exactly the same composition as the one surround- 

 ing Half Moon Pond, previously described. The larger open 

 bog portion consists of a subtratum of sphagnum mixed with a 

 coarse sedge (^/) rising two feet above the surface. Through 



