No. 631] FACTORS OF HEREDITY 113 



the intermediate distances (50.0), whereas the frequency 

 of separation found between y and B in the actual ex- 

 periment is 41.6. Similarly, the 1 'model" shows too high 

 a frequency for the other longer distances involved. 

 (The long distances y s and bi B are 36.2 and 43.9 re- 

 spectively on the model, but only 34.6 and 38.6 in the 

 data ; the moderately long distances y v, bi s, and cl B 



