1909.] The Cultivation of Watercress. 833 



in watercress beds are to some extent regulated by the indus- 

 try and cleanliness of the cultivator. The most troublesome 



Washing Watercress before Packing. 



"Bunching" Watercress. 

 of all are the several species of Lemna, particularly Lemna 

 minor, the lesser Duckweed, which can only be kept in check 



