422 



BIOLOGY FOR BEGINNERS 



Defects of the Eye. The care of the eye is dealt with in the 

 chapter on hygiene, but it is well to remember that seldom are they 

 perfectly normal and frequent examination by a competent physi- 

 cian is the only sure way of preserving their health. Below are 

 tabulated some of the common conditions and their causes, but 

 only an expert can determine the exact kind of lens or method of 

 treatment which will remedy the defect. 



COLLATERAL READING 



Animal Studies, Jordan, Kellogg and Heath, pp. 371-386; Animal 

 Life, Jordan and Kellogg, pp. 224-239; Physiology Textbook, Colton, pp. 

 284-300; General Physiology, Eddy, pp. 436-485; Applied Physiology, 

 Overton, pp. 268-275; The Human Mechanism, Hough and Sedgwick, pp. 

 244-265; The Human Body and Health, Davison, pp. 237-258; Studies 

 in Physiology, Peabody, pp. 291-320; The Human Body, Martin, pp. 

 263-294; Elementary Physiology, Huxley,5 pp. 367-457; High School 

 Physiology, Hughes, pp. 239-260. 



SUMMARY 



Response to environment. 



1. Irritability. 



2. Touch. 



3. Taste. 



4. Smell. 



5. Hearing 



(a) Structure of ear. 



Outer ear, auditory canal and lobe. 

 Middle ear, bones, eustachian tube. 

 Inner ear, cochlea and nerve endings, semicircular canals. 



