CHA1-. II 



ILEMATOCOCCUS 



241 



when divided by 300. It has been found that such 

 organisms as Hismatococcus travel at the rate of one foot 

 in from a quarter of an hour to an hour ; or, to express 



I'lG. 68. — A, I licniiitococciii' /'litviaiis, niuLile pha.sc. Living ^[jeLiiucii, ^Iiuwihl; 

 protoplasm \\'\\\\ chioiiuitophores (c/ir) and pyrenoids {_/>}'>')■, cell-wall (c. 7v) 

 connected to cell-body by protoplasmic filaments, and flagella (y/). The sluIc 

 to the left applies to Figs. A — D. 

 1!, vesting stage of the same, showing nucleus {nii) with nucleolus (//«'), and thitl: 

 cell-wall {c. 1") in contact with the protoplasm. 



C, the same, showing division of the cell-body in the resting stage into four 

 daughter-cells. 



D, the same, showing the development of flagella and detached cell-wall by the 

 daughter cells before their lilaeration from the enclosing mother-cell-wall, 



E, H<pmatococciis laci<stris, showing nucleus {nu), single large pyrenoid {pyr), 

 and contractile vacuole (c. vac). 



F, diagram illustrating the movement of a flagellum ; ab. its base ; c, c' , c" . differ- 

 ent positions assumed by its apex. (From Parkei*'s Biology : ]i), after Biitschli.) 



the fact in another and fairer way, that they travel a distance 

 equal to two and a half times their own diameter in one 

 second. In swimming the pointed end is alwa)'s directed 

 Pkact. 2uul. R 



