232 PHYSICAL EXPRESSION. 



pea-plant, if kept in a room with deficient light, is 

 not well nourished, and the ill nutrition is indicated 

 by the small yellow leaves and the long white 

 stem. That assimilation has not occurred during 

 the life of the plant is demonstrated by the fact 

 that the plant when dry weighs less than the seed 

 from which it grew.- Here ill nutrition is expressed 

 by the relative growth of leaves and stem, the 

 leaves being very small, the internodes very long. 

 In children we often see growth for. a time occur in 

 height without lateral development ; then the pro- 

 portions of growth change, and the child fattens. 



Rest is probably a condition of nutrition, leading 

 to the signs of recreation indicated by subsequent 

 activity. The most essential element in the ex- 

 pression of the condition rest is the subsequent 

 activity, i.e. the sequential series of movements and 

 reflexes. Take a case uncomplicated by sleep. 

 During rest there is impressionability, which affords 

 a distinguishing character between simple rest and 

 sleep. Arising out of this we have the fact that in 

 rest, uncomplicated by sleep, the eyelids usually 

 remain open ; that is, the levator palpebrae still re- 

 ceives a stronger impulse than the orbicular muscle. 



One of the special characters of rest is the 

 absence of movement, although impressionability is 

 retained. Rest is usually preceded by fatigue, and 

 it is followed by activity ; the sequential signs of 

 recreation and activity indicate that during the 

 period in which movement was absent there was 

 rest. Kest is expressed by the present signs of 

 rest, folio wed ^by the signs of recreation and activity. 



