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EXPERIMENTS WITH PLANTS 



growing, strain it through a cloth, and fill five vials 

 or bottles almost half full of it. Insert in the mouth 

 of each vial (or bottle) a firm cotton plug made by 



205. Different kinds of bacteria: (a) spherical bacteria imbedded in a gelati- 

 nous film which floats on the surface of the liquid, (b) rod-like forms, (c) bac- 

 teria multiplying by division into two, (d) bacteria of lock-jaw (tetanus), with 

 a spore at one end, (e) elongated rods, (f) rod-like forms dividing, (g) rod- 

 like forms with a spore in each, (h) spiral forms. 



rolling the cotton into a firm roll just large enough to 

 fit the vial. Place one of the bottles (a) in a warm 

 place in the light, another (&) in a warm place in the 

 dark, another (c) in a cool place (preferably on ice) 



