The Unity of ike Organism 



tista," ' the implication being that the protozoa are not 

 "true animals." "Organless organisms" is an appellation 

 one not infrequently finds applied to protozoa. 



(a) Comparison of Certain Ciliates and Metazoam 



By way of introduction to the commentary I wish to make 

 on this mode of thinking, I ask the reader to compare the 

 pictures, figures 1 and 2, keeping the idea of cell as much 



5^ 



crrfc.cav. 



-ov-y. 



ms 



ov. 



FIGURE 2. HYDRA (AFTER PARKER AND PARKER). 



<-ct., ectoderm. end., endoderm. ent.cav., enteric cavity. ml 

 mouth. hyp., liypostnme. msgl., mesogloea. ntc., nematocysts. 

 psd., pscudopods. fl., flagella. bd., buds, spy., spermary. ovy., 

 ovary, ov., ovum. 



