THE EVOLUTION OF MAN 



ble walls of the individuals into the other cells 

 clustered closely around them and down to the 

 other pole of the bubble, so that all of them were 

 fed. But nevertheless a certain part of this lump 

 of cells gradually developed a capacity for spe- 

 cial work in the interest of the entirety. The 

 other cells did not remain inactive during this 

 process. Since they were fed without being com- 

 pelled to perform the work of actual eating, they 

 devoted themselves much more actively to the 

 movement and protection of the whole. The 

 practical result was that the devouring cells were 

 gradually surrounded by a wall of protecting 

 cells, so that they assumed a sheltered position 

 in the center and were literally under the shelter 

 of the others. At the same time they had to re- 

 main in touch with the food that drifted down 

 against them with the time. So they bent inward 

 and formed a pocket by rolling themselves inside 

 all the other cells, just like an inverted glove. 



I am giving simply some general indications 

 here, in order to suggest the way in which this 

 development might have come about. Surely 

 this, or some other method, must have been the 

 cause of the cuplike form of uni-cellular animals, 

 with the devouring cells, or stomach, in the cen- 

 ter and the skin cells in the periphery, the proto- 

 type of the Gastraea. 



129 



