200 
Sarah M. Baker. 
mental study, owing to the small size of the gametes. To see 
whether it would be possible to grow the seaweeds under different 
conditions with regard to dessication from those to which they 
were accustomed, a considerable number of very small plants were 
collected off the rocks, each species being taken from the very centre 
ZONING or SEAWEEDS 
YOUNG SEAWEEPG GROWN 3 WEEKS' j 
tN WATER 6 HUB , —- DRY 6 MRS . 
Ascophyllum Nodosum 
‘ t f ^ i 
N 
Fucoa % UWClDEb 
Fig. 29. In water 6 hours ; dry 6 hours, x §■ Fuchs scrratus ; most of 
the specimens died in about two weeks. Fucus vesiculosus grew quickly, but 
became somewhat shrivelled. Asco.phyllum nodosum grew well ; no specimen 
died. Fucus ceranoides grew best under these conditions. 
of its zone ; these were divided as equally as possible between three 
jars. The sea-water in the jars was changed once every twelve 
hours; but during the course of the twelve hours one jar (A) was 
left dry for one hour and under water for eleven hours ; the second 
(B) was dry for six hours and under water for six hours ; the third 
(C) was dry for eleven hours and under water for one hour. By 
