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F. W. Oliver. 
available. That these conditions coincide with a phase of active 
growth in the marsh itself is not surprising. The general map of 
the area constructed in 1904, when compared with the present 
condition of the marsh, shews that active change is in progress in 
many places (cf. Fig. 15, A, A 1 and B), whilst considerable tracts of 
hare sand are now in various stages of early colonisation by 
halophytes. Reference to old photographs dating hack to the 
same period serves only to confirm the evidence of the map, whilst 
Fig. 15. Sketch map of the Bouchc d’ Erquy shewing the complex 
system of natural irrigation-channels by which the tide gains access to 
the marsh. The plant-associations are not represented. The areas adjacent 
to the two principal channels (heavy black) consist of established turf, 
whilst the region on the right, running up to the dunes, corresponds to an 
earlier phase of development. The shading at A — A and A 1 marks the 
pioneer zones of Salhoritia radicans , whilst at B — B (cross-hatching) 
Salicornia nmiosissiwa plays an analogous role. The banks of the main 
channel are not drawn in its lower part, but its course is indicated by arrows. 
Scale 1/8750. 
