10 



Turning to Table II, measnrements of tlie lougest Icaf of plauts wliicli 

 have been growing ou soft bottom in deep water, we come to quite differeut 

 results. It is first observed that the leaves are much louger liere thau ou hard 

 bottom aud in low water, GO — 245 cm. as com])ared with 28 — 110 cm., which is 

 more thau twice as long; the breadth is likewise much greater (4,5 — 8,o mm. as 

 compared with 2,5 — 4,5 mm.). The variations in the measnrements for a siugle 



Table III. 



Channel off Holckenhavn. 



Hard bottom, 1—1'. fathoms. 



Tlie length of all the leaves of some plants (in cm.); 



each line corresponds to one plant. 



