BASIS OF IZ. • Z5TIGATION. _: 



] he amount of use necesss ring the individual to, and main- 



tain it at, the average fundi capacity : : the species to which it 



dongs ma] and the amount necessary for 



particular called Before an in- 



dividual can an the average :.l capacity of the species 



to which it belongs it must have passed From the adolescent to the 

 adult stage. The distance into the I -:age which an individual 



ma the average : r its species depends partly upon 



its inherited fund and partly upon the degree of its 



functional act Hence the acquired functional capacity of an 



individual is represented by | annus the normal use. 



In I his cox uld be remembered that the normal use for 



I i Gxs iggregate of" use, but varies 



ith the age of the inc. laL Thus, after an individual has ar- 

 rived at 1 ge functi . nal capacity of its species it must con- 

 tinue its normal use f -e of maintaining tself at this 

 standard. If the :: coi :inue this normal use it falls 

 below the - iard and we have a case of disuse. Ordinarily the 

 normal use an "age use do not differ much, but when an 

 individual possess - gan endowed ': ty with great func- 

 tional capac!:;. | tnal use is much less t . the average use 

 and, cor/ ndividual in! rits less than the average 

 al capa. it the norn" as greater than the average 



THE 1CEAS1 F USE-INHERITANCE 



From our :' the word use, it is evident tint to have 



in a - then must have been, on the part 



the ance?: r an aggregate use greater than the normal use for 



ftcestoi Stal : rds. use-inheritance is to be meas- 



i Dunt of use for each ancestor and not by the aggre- 



