24 THE PSYCHIC LIFE 



colored by yellow chlorophyl (Uroglena volvox, etc.). 

 Generally, there is only one spot, situated at the base 

 of the flagellum. This is seen especially in the Euglena 

 viridis, a small flagellate infusory, which is very 

 abundant in fresh waters, which it often covers with 

 a thick green coating. 



In the Synura uvella, a colony-forming flagellate, 

 there exist in each individual, in the anterior part of 

 the body, numerous spots, varying from two to ten. 



Below we give an illustration representing the 

 anterior extremity of the Euglena Ehrenbergii, ac- 

 cording to Klebs. A large ocular spot is noticeable^ 

 in contiguity with the contractile reservoir. Ehren- 

 berg, deceived by the appearance of these two or- 

 gans, had taken the contractile reservoir for a nerve 

 ganglion. 



It is not only in the large 

 group of Protozoans that the red 

 spots are met with; they are 

 found also among the vegetable 

 Micro-organisms. A large num- 

 ber of green-colored zoospores 

 exhibit at the anterior, and Fig . ^.-Anterior extremity of 

 usually colorless, extremity of 

 their bodies, a small red point 

 which seems to have exactly the tractile reservoir ' 

 same structure as the red spot of the Euglenae. It was 

 on this fact that Stein based his opinion that the 

 spot of Euglena is not an eye; to him it seemed im- 

 possible to admit that the vegetable Proto-organisms 

 could possess a visual organ. This is an excellent 

 instance of a priori reasoning. Later on we shall 

 see that Stein's view has now been completely 

 abandoned; the very opposite view is taken, for the 



