368 CELL INTELLIGENCE THE CAUSE OF EVOLUTION 



telligence. Another species called diatones build around 

 themselves a covering like transparent flint, and are able 

 to produce styles and patterns of great complexity and 

 beauty. They imitate the designs produced by the natu- 

 ral forces in matter called crystallization. Man also does 

 the same thing. In what manner do the actions of the 

 cell building itself a protecting coat and going in search 

 of food, differ from those of man when he also provides 

 himself with clothes and goes in search of food. Another 

 species of single cell living in the ocean has not only 

 provided himself with a covering hard as flint and trans- 

 parent as. glass, but also with search lights. It is called 

 the noctiluca, Fig. 46. Mr. Schute in his book on Evolu- 

 tion describes it as follows : 



FIG. 46. Noctiluca miliaris. Dorsal view. SCHUTE. 



"This little one-celled animal has the power, through 

 its special chemical activities, of manufacturing and mak- 

 ing light. It is through the agency of myriads of these 

 little creatures that the diffuse luminosity of some seas is 

 produced and can be observed at night. If the jar be 

 placed in the dark and agitated in the slightest degree, 

 there is an instantaneous display of light which is of a 

 beautiful greenish tint and is so vivid that it can be ob- 

 served in ordinary lamplight. This phosphorescence is 

 only of one instant's duration and a short rest is necessary 

 for each renewal." The special locality of the searchlights 



