50 ELEMENTARY BIOLOGY. [VI. 



a. Made up externally of five twisted cells, bearing 

 at their apices five smaller, not twisted cells. 



/3. Cut sections from imbedded specimens, and 

 examine with a high power : make out the 

 large central nucleated cell; the fatty and 

 starchy matters contained in it; stain with 

 iodine. 



7. Press out chromic acid specimens in glycerine ; 

 make out the above points (d. a. /:?). 



S. Examine chromic acid specimens for young 

 spore-fruits, and press them out in glycerine: 

 make out in the 'youngest the five roundish 

 cells surrounding a central one ; then in older 

 specimens the elongation, and twisting of the 

 external cells, and the separation of their apices 

 as five distinct cells. 



e. The Antheridia. 



a. Examine, with a low power, a ripe (orange- 

 coloured) one. 



a. Make out its external dentated cells. 



/3. Tease out a ripe antheridium in water; and 

 examine with a high power ; note the flat, 

 dentated, nucleated external cells; the cylin- 

 drical cell (manubrium) springing perpendicu- 

 larly from the inner surface of each; the 

 roundish cell (capitulum) on the inner end of 

 the manubrium ; the six secondary capitvla 

 attached to the capitulum; the thread-like 

 filaments (usually four) proceeding from each 

 of the secondary capitula. 



