216 



Papers from the Department of Marine Biology. 



currents off the California coast. Vertical currents occur also off the 

 coast of Norway and in the eastern Mediterranean in winter. I have 

 found local and diurnal changes in the O2 and CO2 content of the sur- 



~7] I ? 



ri ) // V --^^1 I -J - -^ I^ V I / 



Fig. 1. — Winds of the Atlantic Ocean. The long arrows show directions of steady 

 winds, the short arrows the prevailing directions of variable winds. 



face correlated with the presence of plants attached to the bottom (off 

 the Florida Keys), indicating a complete inversion of the water or mix- 



