182 



HUMAN PHYSIOLOGY 



CHAP. 



FlG. 98. Correct position at school desk. 



The correct, natu- 

 ral, easiest standing 

 position demands that 

 the feet be placed as 

 when toeing a line, 

 and that the weight 

 of the body be thrown 

 equally upon the two 

 legs. In such a pos- 

 ture the trunk is 

 evenly poised, and all 

 parts of the body are in 

 their natural places. 



The correct sitting posture demands that the pelvis rests 

 equally on the seat, 

 with the body erect 

 and the head so placed 

 that the line of direc- 

 tion falls within the 

 line joining the bones 

 of the pelvis resting 

 on the seat. This 

 may be called a sym- 

 metrical posture, as it 

 is the easiest to main- 

 tain for any length of 



FIG. 99. Desk and seat too small. Head 

 and spine bent, and legs and feet cramped. 



time, because it re- 

 quires the smallest 

 expenditure of muscle energy, and leads to physical 

 beauty and proper carriage. 



