FACTS AND FACTORS OF DEVELOPMENT 39 



structure can be seen, but this shows only that 

 physiological tests may be more delicate than 

 morphological ones. In certain lines of mod- 

 ern biological work, such as bacteriology, 

 cytology, and genetics, many functional dis- 

 tinctions are recognizable between organisms 

 which are morphologically indistinguishable. 

 But this does not signify that functional 

 changes precede structural ones, but only that 

 the latter are more difficult to see than the 

 former. For every change of function it is 

 probable that an "unlimited microscopist" 

 could discover a corresponding change of 

 structure. 



II. DEVELOPMENT or THE MIND 



The development of the mind parallels that 

 of the body: whatever the ultimate relations 

 of the mind and body may be, there can be no 

 reasonable doubt that the two develop together 

 from the germ. It is a curious fact that many 

 people who are seriously disturbed by scientific 

 teachings as to the evolution or gradual de- 

 velopment of the human race accept with 

 equanimity the universal observation as to the 



