VITALITY 



247 



any one link in the chain of vital activities will have its effect on 

 the general vitality. 



It is not improbable that internal reorganization, or disorganiza- 

 tion, with increase or decrease of activity in all or in some part of 

 the protoplasmic make-up may bring about similar variations in 

 vitality. Thus changes in organization may be effected by amphi- 

 mixis or by long-continued metabolic functioning with correspond- 



;/ 



# i 



Fig. 129. — Uroleptus mobilis. Division of double individual; type with one divi- 

 sion nucleus. D, the single nucleus formed by fusion of the two independent sets of 

 maeronuclei ; E, first division of the single nucleus; F, reconstruction after division 

 with a new type of macronucleus formed from the single division nucleus. (After 

 Calkins.) 



ing effects upon the general vitality. The chemical and physical 

 make-up of the protoplasm of an individual may change with con- 

 tinued metabolic activities and lead to a change from what is termed 

 a labile condition when actions, reactions and interactions are per- 

 fectly balanced and at a maximum of activity, to a more stable 

 condition when these activities become increasingly unbalanced or 

 cease altogether. 



