296 



ROBERT T. HANCE 



per cent 



Two vacuoles 23 . 5 



Three vacuoles 61 . 3 



Four vacuoles 13.4 



Five vacuoles 0.22 



Six vacuoles . 042 



Seven vacuoles 0.0001 



Chart 2 This chart gives a graphic illustration of the comparative numbers 

 of two, three, four, five and six-vacuoled animals. This chart was prepared 

 from data on ten thousand animals living under all conditions of medium. 



