-5cm.- 



FIG. 366. Zonation about a pond 



I, pond ; II, bog zone ; III, swampy thicket zone ; IV, incomplete zone in arid soil 

 of a sand pit; V, dry meadow zone; VI, dry woodland zone; a, floating mass 

 of Eriocaulon; b, deepest area in pond, six to ten feet; c, small patch of tall 

 rushes (Juncus militaris) ; d, birch woodland (Betulu populifolia) ; WE, line * 

 intersecting associations of west side of pond ; SN, line intersecting associations 

 of north end of pond 



476 



