10 



OUTLINES OF PLANT LIFE. 



16. Cilia. — Most species are furnished with organs of 

 movement consisting of fine threads of protoplasm protruded 



a •? 



°^° 



Fig. 8. — Various bacteria, a, Micrococcus, the "blood-portent"; &, zoogloea f orm - 

 of the same ; c, Bacterium acetiy the ferment of vinegar; d, Sarcina. a harmless 

 parasite of the human intestine, a, b, magnified 300 diam.; c, 2000 diam.; d, 800 

 diam.— After Kemer. 





^f. 



fi^\. (^ 



^G 



Fig. g.— Bacteria stained to show cilia. A, cilia tufted at one end; B, cilia irregularly 

 distributed over body ; C, cilium single at oneor both ends. B, the bacillus of typhoid 

 fever; C, the bacillus of Asiatic cholera. Magnified 775 diam.— After Migula. 



through the wall. These, by their sudden contraction on one 

 side, lash about like whips, and propel the cell by jerky, 

 darting motions through the fluid in which it swims. These 



