Xll CONTENTS. 



PAGE 



experiments Cerebral localization Nerve-centres 

 Visual perception indicated by movements -Time requisite 

 for a reflex movement Inhibition of movement Physio- 

 logical effects of light, in man, in plants Light stimulates 

 trophic and kinetic action Effects of light in the new- 

 born infant; movements stimulated, inhibited, co-ordi- 

 nated Retentiveness to effects of light The brain of 

 an idiot not thus impressionable to light Summary of 

 the effects of light Extrinsic stimuli, mediate and im- 

 mediate Trophic action of light Summary of effects of 

 light on plants ... ... ... ... ... ... 82 



CHAPTER VII. 



PATHOLOGICAL FACTS AND EXPRESSION IN PATHOLOGICAL 



STATES. 



Disease may destroy or irritate parts of the brain Destruc- 

 tion of corpus striatum Lateral deviation of the head 

 and eyes Effects of irritation in contrast with destruction 

 of a brain area Effects of disease on different sets of 

 muscles Facial palsy Localization of disease Epilepsy 

 Chorea Analogy to movements in plants Experi- 

 ments with the mimosa The study of chorea Finger- 

 twitching in nervous children Tooth-grinding Head- 

 aches in children ; the physical signs Cases of athetosis 

 Defects of development ; their frequent coincidence . . . 104 



CHAPTER VIII. 



POSTURES CONSIDERED AS MEANS OF EXPRESSION. 



Definition of a posture Simplicity of study Historical 

 records of postures Postures of all parts A change of 

 posture is movement A posture is due to resultant action 

 of muscles and their nerve-centres It is a direct mode 

 of expression Free or disengaged parts most expressive 

 A limb labouring is not susceptible to mental expression 

 Organic postures, as from difficult breathing Postures 

 due to gravityEffect of gravity on plants Gravity acts 

 differently during sleep It can affect the postures of the 



