MOTION AND GROWTH IN THE FUCACEiE. 

 / 



21 



HI In In 



Fig. 



1. Tvro cells of a process iu the conceptacle of Fucus vesiculosus. 



a. Distal cell. 

 a'. Pioxiaial cell. 



a". Appearance of distal cell after f hour. 



2. Two cells of another process. 



b. Distal cell, with its top on a level with the intercellular wall of 



process 1. 

 b'. Appearance and position of the distal cell after \ hour. 

 b". „ „ after | hour. 



b'". „ „ after f hour. 



The oiiject-glass was a good penetrating ^-inch. 



transparent cell-wall, and its contents were, 1, a homogeneous 

 protoplasm less transparent than water ; and 2, four refractile 

 circular granules. 



The cell-wall gave for the most part the usual double line 

 under the microscope ; but here and there the external line 

 was alone apparent, the inner being represented by a curve 

 in one place and by a sharp inward bend in another. The 

 substance included between the external sti-aight line and the 

 curved line was homogeneous, but had a different refractibility 

 to the rest of the cell contents. 



In the lower cell («') two large incurvings of the cell-wall 

 were noticed, and the wall between the cells was single, and 

 presented two lines to view, the ends of which, where they 

 joined the outer cell-walls, were slightly curved. 



The top of the second process (fig. 2, b) was exactly on a 

 level with this intercellular partition. 



There were no refractile granules in the distal cell (b) of 

 this second process, and its cell-wall had a double line 

 throughout. The contents of the cell were a transparent 

 homogeneous protoplasm, and a portion of more opaque struc- 

 tureless material quite at the end. 



After the lapse of a quarter of an hour the distal cell jUst 



