390 



Smith : Notes on the Vegetation of Ponds. 



the case when we saw it. The muddy bottom did not look 

 tempting- for wadin_<>-, and as an investigation of the ponds was 

 not anticipated, we had wo means of determining- the exact 

 depth. No inflow channel could be distinguished, the northern 

 end being a uniform grassy slope. The supply of water seems 

 to be maintained by surface drainage, although the clear-water 

 patch suggests springs, but whether these are probable in the 





^ ^ 



Bog-bean. 

 Water Horsetail. 



— Water Dropwort. 



— Bur-reed. 



— Water Parsnip. 



t = 



Slender-beaked Seds^e. 



(Further explanation in 



text.) 



Fig. I.— The Bog--bean Pond.* 



boulder clay we leave to be determined. The vegetation was 

 distributed in an interesting way. Considered generally, it 

 consisted of a mass of Sedge [^Carex ampullacea) at the southern 

 end, a patch of Water Parsnip (^Siuni erectuni) at the northern 

 end of the clear water, and an elongated horse-shoe mass of 



* Mr. F. Cavers, B.Sc. (Technical School, Plymouth), kindly assisted in 

 preparing- the drawings from which the blocks are reproduced. 



Naturalist, 



