452 TRANSMISSION 



SPECIAL EXERCISES 



The student should have extensive practice in making frequency distri- 

 butions of different species and in working out standard deviations and 

 coefficients of variability. He will thus not only become familiar with the 

 methods of work, but he will acquire new conceptions of the whole subject 

 of variability and type. The teacher should require the student at this 

 point to make original studies on his own account, and to prosecute the 

 work until he becomes entirely familiar both with the methods and with the 

 conceptions involved. 



ADDITIONAL REFERENCES 



THE GRAMMAR OF SCIENCE. By Karl Pearson. Chapter X. 

 VARIATION IN ANIMALS AND PLANTS. By H. M. Vernon. Chapter I. 



