THE NATURE AND REACTIONS OP PROTOPLASM. 



the ectoplasm, causes the more fluid internal part to push out 

 the ectoplasm, as it were. Ciliary action may possibly be 

 explained on this hypothesis ; and in the case of the absorptive 

 cells (root-hairs) of roots the ectoplasm is able to exercise a 



Pig. 2. — Amosba Pkinceps. — The figures show demarcation into clear 

 ectoplasm and granular endopJasm, and change in shape of an 

 organism at intervals of one minute. The nucleus and the "con 

 tractile vacuole" (an excretory structure) are seen in the endoplasm. 



marked selective capacity over the absorption of food materials 

 (salts in solution in the soil). 



