50 ELEMENTARY BIOLOGY. [Y 



a. Made up externally of five twisted cells, bearin 

 at their apices five smaller, not twisted cells. 



^. Cut sections from imbedded specimens, an 

 examine with a high power: make out th 

 large central nucleated cell; the fatty an 

 starchy matters contained in it; stain wit 

 iodine. 



Y. Press out chromic acid specimens in glycerine 

 make out the above points (d. a. yS). 



S. Examine chromic acid specimens for younj 

 spore-fruits, and press them out in glycerine 

 make out in the youngest the five roimdisl 

 cells surrounding a central one; then in olde 

 specimens the elongation, and twisting of thi 

 external cells, and the separation of their apice 

 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. 



yS. Tease out a ripe antheridium in water; aii( 

 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; thi 

 roundish cell (capitulum) on the inner end o 

 the manubrium; the six secondary capitvk 

 attached to the capitulum ; the thread-liki 

 filaments (usually four) proceeding from eacl 

 of the secondary capitula. 



