Text-book of structural and physiological botany . Fig. 371.—Antherozoids : I. oiNitella sy7icarpa (Characese. x 500) ; II. ofCEdogoiihim ge7nellipar7ivt (Alga;, x 800). are enabled to perform their movements, are still unknown;but they are certainly connected with the vibratile cilia, orminute threads of protoplasm of different lengths and vari-able number, the vibrations of which set the body inmotion. But it must be admitted to be a most wonderfulcontrivance for the maintenance and propagation of anumber of vegetable organisms. Neither swarmspores nor antherozoids are provided witha cell-wa
Text-book of structural and physiological botany . Fig. 371.—Antherozoids : I. oiNitella sy7icarpa (Characese. x 500) ; II. ofCEdogoiihim ge7nellipar7ivt (Alga;, x 800). are enabled to perform their movements, are still unknown;but they are certainly connected with the vibratile cilia, orminute threads of protoplasm of different lengths and vari-able number, the vibrations of which set the body inmotion. But it must be admitted to be a most wonderfulcontrivance for the maintenance and propagation of anumber of vegetable organisms. Neither swarmspores nor antherozoids are provided witha cell-wall—or, at all events, with only an extremely delicateone— during their period of motility. Still more remarkablethan these must, therefore, be considered the movements ofthe Diatomaceae, [Desmidieae], Oscillatorieae, Spirulineae, andsome other organisms which are enclosed in a complete cell- The L ife of the Plant. 201 wall, or even in a hard siliceous coating, as in the caseof the Diatomaceae ; but it is believed that the cause oftheir act
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