STRUCTURE OF AMCEBA 



III 



along with drops of water, which form food vacuoles in the 

 cell substance. Into these vacuoles digestive ferments flow ; 



D 



Fig. 45. — Amceba proteus. — After Lucy A. Carter. 



EC, Clear ectoplasm, sometimes showing fine radial striation. 



EN., More granular endoplasm. The granules are partly nutritive substances in 



reserve, partly waste products and undigested debris. 

 F.V., Food vacuoles, droplets of water surrounding food particles. A solid particle 



is shown in process of digestive disintegration. 

 C.V., A contractile vacuole with excretory function. 



D., A diatom that has been engulfed as food. 

 PS., A pseudopodium. 

 N., The nucleus showing chromatin bodies (represented as dark granules). 



the contents of the vacuoles are first acid and then alkaline, 

 which recalls the change of reaction in the alimentary 

 canal in mammals ; but it is doubtful if there is true 



