71 



the speckled alder must first be used. I intend to construct a dam 

 in this ditch in order to form one or more ponds, on tlie banks of 

 which all sorts of water-plants will be grown, alders, willows, reeds, 

 pestilential weed, calamus, flags, etc., so as to provide suitable shelter 

 for water-birds, which are scarce owing to a lack of favourable 

 conditions. 



