ManUai, oif nat^urS study. 161 



{b) Tlie lymph, its composition and use, 

 circulation of lymph. Arrangement 

 and structure of lymphatic vessels. 



{c) The circulation of the blood, how carried 

 on, the heart as a force pump. Action 

 of the valves of the heart. 



{d) Structure and function of the heart 

 arteries, veins and capillaries. Rela- 

 tion to each other, capillary attraction, 

 etc. Changes the blood undergoes 

 during circulation. 



{e) Hygiene of the circulatory system. 

 Effects of alcohol and narcotics. 

 V. Respiratory System. 



(a) Composition of air, diffusion of gases, 

 evaporation, heat, animal heat, radia- 

 tion, etc. 



{b) The skin as a respiratory organ. Struc- 

 ture and function. 



(c) Inhalation and exhalation, how carried 

 on. Organs of. Structure and func- 

 tion of respiratory organs. Adapta- 

 tion of structure to function. 



{d) Relation of respiration to circulation 

 and digestion. 



(e) Hygiene of the circulatory organs. Ven- 

 tilation and heating, exposure, dress, 

 etc. 



